refactor: banking services to Nestjs

packages/server-nest/package.json

@@ -72,7 +72,11 @@
     "rxjs": "^7.8.1",
     "serialize-interceptor": "^1.1.7",
     "strategy": "^1.1.1",
-    "zod": "^3.23.8"
+    "zod": "^3.23.8",
+    "plaid": "^10.3.0",
+    "@supercharge/promise-pool": "^3.2.0",
+    "yup": "^0.28.1",
+    "uniqid": "^5.2.0"
   },
   "devDependencies": {
     "@nestjs/cli": "^10.0.0",
@@ -82,6 +86,7 @@
     "@types/jest": "^29.5.2",
     "@types/node": "^20.3.1",
     "@types/supertest": "^6.0.0",
+    "@types/yup": "^0.29.13",
     "@typescript-eslint/eslint-plugin": "^8.0.0",
     "@typescript-eslint/parser": "^8.0.0",
     "eslint": "^9.0.0",

packages/server-nest/src/models/Model.ts

@@ -1,6 +1,25 @@
-import { Model } from 'objection';
+import { Constructor, Model, QueryBuilderType, TransactionOrKnex } from 'objection';
 
 export class BaseModel extends Model {
   public readonly id: number;
   public readonly tableName: string;
+
+  static get QueryBuilder() {
+    return PaginationQueryBuilder;
+  }
+}
+
+class PaginationQueryBuilder<M extends Model, R = M[]> extends Model.QueryBuilder<M, R> {
+  pagination(page: number, pageSize: number) {
+    return super.page(page, pageSize).runAfter(({ results, total }) => {
+      return {
+        results,
+        pagination: {
+          total,
+          page: page + 1,
+          pageSize,
+        },
+      };
+    });
+  }
 }

packages/server-nest/src/modules/Accounts/models/Account.model.ts

@@ -12,6 +12,7 @@ import { TenantModel } from '@/modules/System/models/TenantModel';
 // import { ModelSettings } from '@/modules/Settings/ModelSettings';
 import { AccountTypesUtils } from '@/libs/accounts-utils/AccountTypesUtils';
 import { Model } from 'objection';
+import { PlaidItem } from '@/modules/BankingPlaid/models/PlaidItem';
 // import AccountSettings from './Account.Settings';
 // import { DEFAULT_VIEWS } from '@/modules/Accounts/constants';
 // import { buildFilterQuery, buildSortColumnQuery } from '@/lib/ViewRolesBuilder';
@@ -25,17 +26,20 @@ import { Model } from 'objection';
 // ]) {
 
 export class Account extends TenantModel {
-  name: string;
+  public name!: string;
-  slug: string;
+  public slug!: string;
-  code: string;
+  public code!: string;
-  index: number;
+  public index!: number;
-  accountType: string;
+  public accountType!: string;
-  predefined: boolean;
+  public predefined!: boolean;
-  currencyCode: string;
+  public currencyCode!: string;
-  active: boolean;
+  public active!: boolean;
-  bankBalance: number;
+  public bankBalance!: number;
-  lastFeedsUpdatedAt: string | null;
+  public lastFeedsUpdatedAt!: string | null;
-  amount: number;
+  public amount!: number;
+  public plaidItemId!: number;
+
+  public plaidItem!: PlaidItem;
 
   /**
    * Table name.

packages/server-nest/src/modules/App/App.module.ts

@@ -54,6 +54,8 @@ import { CreditNoteRefundsModule } from '../CreditNoteRefunds/CreditNoteRefunds.
 import { BillPaymentsModule } from '../BillPayments/BillPayments.module';
 import { PaymentsReceivedModule } from '../PaymentReceived/PaymentsReceived.module';
 import { LedgerModule } from '../Ledger/Ledger.module';
+import { BankRulesModule } from '../BankRules/BankRules.module';
+import { BankAccountsModule } from '../BankingAccounts/BankAccounts.module';
 
 @Module({
   imports: [
@@ -132,6 +134,9 @@ import { LedgerModule } from '../Ledger/Ledger.module';
     BillPaymentsModule,
     PaymentsReceivedModule,
     LedgerModule,
+
+    BankAccountsModule,
+    BankRulesModule,
   ],
   controllers: [AppController],
   providers: [

packages/server-nest/src/modules/BankRules/BankRules.controller.ts

@@ -0,0 +1,46 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  Param,
+  Post,
+  Put,
+} from '@nestjs/common';
+import { BankRulesApplication } from './BankRulesApplication';
+import { ICreateBankRuleDTO, IEditBankRuleDTO } from './types';
+
+@Controller('banking/rules')
+export class BankRulesController {
+  constructor(private readonly bankRulesApplication: BankRulesApplication) {}
+
+  @Post()
+  async createBankRule(
+    @Body() createRuleDTO: ICreateBankRuleDTO,
+  ): Promise<void> {
+    return this.bankRulesApplication.createBankRule(createRuleDTO);
+  }
+
+  @Put(':id')
+  async editBankRule(
+    @Param('id') ruleId: number,
+    @Body() editRuleDTO: IEditBankRuleDTO,
+  ): Promise<void> {
+    return this.bankRulesApplication.editBankRule(ruleId, editRuleDTO);
+  }
+
+  @Delete(':id')
+  async deleteBankRule(@Param('id') ruleId: number): Promise<void> {
+    return this.bankRulesApplication.deleteBankRule(ruleId);
+  }
+
+  @Get(':id')
+  async getBankRule(@Param('id') ruleId: number): Promise<any> {
+    return this.bankRulesApplication.getBankRule(ruleId);
+  }
+
+  @Get()
+  async getBankRules(): Promise<any> {
+    return this.bankRulesApplication.getBankRules();
+  }
+}

packages/server-nest/src/modules/BankRules/BankRules.module.ts

@@ -0,0 +1,34 @@
+import { Module } from '@nestjs/common';
+import { CreateBankRuleService } from './commands/CreateBankRule.service';
+import { EditBankRuleService } from './commands/EditBankRule.service';
+import { DeleteBankRuleService } from './commands/DeleteBankRule.service';
+import { GetBankRulesService } from './queries/GetBankRules.service';
+import { GetBankRuleService } from './queries/GetBankRule.service';
+import { BankRulesApplication } from './BankRulesApplication';
+import { RegisterTenancyModel } from '../Tenancy/TenancyModels/Tenancy.module';
+import { BankRuleCondition } from './models/BankRuleCondition';
+import { BankRule } from './models/BankRule';
+import { BankRulesController } from './BankRules.controller';
+import { UnlinkBankRuleOnDeleteBankRuleSubscriber } from './events/UnlinkBankRuleOnDeleteBankRule';
+
+const models = [
+  RegisterTenancyModel(BankRule),
+  RegisterTenancyModel(BankRuleCondition),
+];
+
+@Module({
+  controllers: [BankRulesController],
+  imports: [],
+  providers: [
+    ...models,
+    CreateBankRuleService,
+    EditBankRuleService,
+    DeleteBankRuleService,
+    GetBankRuleService,
+    GetBankRulesService,
+    BankRulesApplication,
+    UnlinkBankRuleOnDeleteBankRuleSubscriber
+  ],
+  exports: [...models],
+})
+export class BankRulesModule {}

packages/server-nest/src/modules/BankRules/BankRulesApplication.ts

@@ -0,0 +1,67 @@
+import { Injectable } from '@nestjs/common';
+import { CreateBankRuleService } from './commands/CreateBankRule.service';
+import { DeleteBankRuleService } from './commands/DeleteBankRule.service';
+import { EditBankRuleService } from './commands/EditBankRule.service';
+import { GetBankRuleService } from './queries/GetBankRule.service';
+import { GetBankRulesService } from './queries/GetBankRules.service';
+import { ICreateBankRuleDTO, IEditBankRuleDTO } from './types';
+
+@Injectable()
+export class BankRulesApplication {
+  constructor(
+    private readonly createBankRuleService: CreateBankRuleService,
+    private readonly editBankRuleService: EditBankRuleService,
+    private readonly deleteBankRuleService: DeleteBankRuleService,
+    private readonly getBankRuleService: GetBankRuleService,
+    private readonly getBankRulesService: GetBankRulesService,
+  ) {}
+
+  /**
+   * Creates new bank rule.
+   * @param {ICreateBankRuleDTO} createRuleDTO - Bank rule data.
+   * @returns {Promise<void>}
+   */
+  public createBankRule(createRuleDTO: ICreateBankRuleDTO): Promise<void> {
+    return this.createBankRuleService.createBankRule(createRuleDTO);
+  }
+
+  /**
+   * Edits the given bank rule.
+   * @param {number} ruleId - Bank rule identifier.
+   * @param {IEditBankRuleDTO} editRuleDTO - Bank rule data.
+   * @returns {Promise<void>}
+   */
+  public editBankRule(
+    ruleId: number,
+    editRuleDTO: IEditBankRuleDTO,
+  ): Promise<void> {
+    return this.editBankRuleService.editBankRule(ruleId, editRuleDTO);
+  }
+
+  /**
+   * Deletes the given bank rule.
+   * @param {number} ruleId - Bank rule identifier.
+   * @returns {Promise<void>}
+   */
+  public deleteBankRule(ruleId: number): Promise<void> {
+    return this.deleteBankRuleService.deleteBankRule(ruleId);
+  }
+
+  /**
+   * Retrieves the given bank rule.
+   * @param {number} ruleId - Bank rule identifier.
+   * @returns {Promise<any>}
+   */
+  public getBankRule(ruleId: number): Promise<any> {
+    return this.getBankRuleService.getBankRule(ruleId);
+  }
+
+  /**
+   * Retrieves the bank rules of the given account.
+   * @param {number} accountId - Bank account identifier.
+   * @returns {Promise<any>}
+   */
+  public getBankRules(): Promise<any> {
+    return this.getBankRulesService.getBankRules();
+  }
+}

packages/server-nest/src/modules/BankRules/commands/CreateBankRule.service.ts

@@ -0,0 +1,61 @@
+import { Knex } from 'knex';
+import { Inject, Injectable } from '@nestjs/common';
+import {
+  IBankRuleEventCreatedPayload,
+  IBankRuleEventCreatingPayload,
+  ICreateBankRuleDTO,
+} from '../types';
+import { UnitOfWork } from '../../Tenancy/TenancyDB/UnitOfWork.service';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { events } from '@/common/events/events';
+import { BankRule } from '../models/BankRule';
+
+@Injectable()
+export class CreateBankRuleService {
+  constructor(
+    private readonly uow: UnitOfWork,
+    private readonly eventPublisher: EventEmitter2,
+
+    @Inject(BankRule.name) private readonly bankRuleModel: typeof BankRule,
+  ) {}
+
+  /**
+   * Transforms the DTO to model.
+   * @param {ICreateBankRuleDTO} createDTO
+   * @returns
+   */
+  private transformDTO(createDTO: ICreateBankRuleDTO): Partial<BankRule> {
+    return {
+      ...createDTO,
+    };
+  }
+
+  /**
+   * Creates a new bank rule.
+   * @param {ICreateBankRuleDTO} createRuleDTO
+   * @returns {Promise<void>}
+   */
+  public async createBankRule(createRuleDTO: ICreateBankRuleDTO): Promise<void> {
+    const transformDTO = this.transformDTO(createRuleDTO);
+
+    await this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onBankRuleCreating` event.
+      await this.eventPublisher.emitAsync(events.bankRules.onCreating, {
+        createRuleDTO,
+        trx,
+      } as IBankRuleEventCreatingPayload);
+
+      const bankRule = await this.bankRuleModel.query(trx).upsertGraph({
+        ...transformDTO,
+      });
+      // Triggers `onBankRuleCreated` event.
+      await this.eventPublisher.emitAsync(events.bankRules.onCreated, {
+        createRuleDTO,
+        bankRule,
+        trx,
+      } as IBankRuleEventCreatedPayload);
+
+      return bankRule;
+    });
+  }
+}

packages/server-nest/src/modules/BankRules/commands/DeleteBankRule.service.ts

@@ -0,0 +1,59 @@
+import { Knex } from 'knex';
+import { Inject, Injectable } from '@nestjs/common';
+import {
+  IBankRuleEventDeletedPayload,
+  IBankRuleEventDeletingPayload,
+} from '../types';
+import { BankRule } from '../models/BankRule';
+import { BankRuleCondition } from '../models/BankRuleCondition';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class DeleteBankRuleService {
+  constructor(
+    @Inject(BankRule.name) private bankRuleModel: typeof BankRule,
+    @Inject(BankRuleCondition.name)
+    private bankRuleConditionModel: typeof BankRuleCondition,
+
+    private readonly uow: UnitOfWork,
+    private readonly eventPublisher: EventEmitter2,
+  ) {}
+
+  /**
+   * Deletes the given bank rule.
+   * @param {number} ruleId
+   * @returns {Promise<void>}
+   */
+  public async deleteBankRule(
+    ruleId: number,
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    const oldBankRule = await this.bankRuleModel
+      .query()
+      .findById(ruleId)
+      .throwIfNotFound();
+
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onBankRuleDeleting` event.
+      await this.eventPublisher.emitAsync(events.bankRules.onDeleting, {
+        oldBankRule,
+        ruleId,
+        trx,
+      } as IBankRuleEventDeletingPayload);
+
+      await this.bankRuleConditionModel
+        .query(trx)
+        .where('ruleId', ruleId)
+        .delete();
+      await this.bankRuleModel.query(trx).findById(ruleId).delete();
+
+      // Triggers `onBankRuleDeleted` event.
+      await this.eventPublisher.emitAsync(events.bankRules.onDeleted, {
+        ruleId,
+        trx,
+      } as IBankRuleEventDeletedPayload);
+    }, trx);
+  }
+}

packages/server-nest/src/modules/BankRules/commands/DeleteBankRules.service.ts

@@ -0,0 +1,28 @@
+import { Knex } from 'knex';
+import { PromisePool } from '@supercharge/promise-pool';
+import { castArray, uniq } from 'lodash';
+import { DeleteBankRuleService } from './DeleteBankRule.service';
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class DeleteBankRulesService {
+  constructor(private readonly deleteBankRuleService: DeleteBankRuleService) {}
+
+  /**
+   * Delete bank rules.
+   * @param {number | Array<number>} bankRuleId - The bank rule id or ids.
+   * @param {Knex.Transaction} trx - The transaction.
+   */
+  async deleteBankRules(
+    bankRuleId: number | Array<number>,
+    trx?: Knex.Transaction,
+  ) {
+    const bankRulesIds = uniq(castArray(bankRuleId));
+
+    const results = await PromisePool.withConcurrency(1)
+      .for(bankRulesIds)
+      .process(async (bankRuleId: number) => {
+        await this.deleteBankRuleService.deleteBankRule(bankRuleId, trx);
+      });
+  }
+}

packages/server-nest/src/modules/BankRules/commands/EditBankRule.service.ts

@@ -0,0 +1,72 @@
+import { Inject, Injectable } from '@nestjs/common';
+import {
+  IBankRuleEventEditedPayload,
+  IBankRuleEventEditingPayload,
+  IEditBankRuleDTO,
+} from '../types';
+import { BankRule } from '../models/BankRule';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class EditBankRuleService {
+  constructor(
+    private readonly uow: UnitOfWork,
+    private readonly eventPublisher: EventEmitter2,
+
+    @Inject(BankRule.name) private bankRuleModel: typeof BankRule,
+  ) {}
+
+  /**
+   *
+   * @param createDTO
+   * @returns
+   */
+  private transformDTO(createDTO: IEditBankRuleDTO): Partial<BankRule> {
+    return {
+      ...createDTO,
+    };
+  }
+
+  /**
+   * Edits the given bank rule.
+   * @param {number} ruleId -
+   * @param {IEditBankRuleDTO} editBankDTO
+   */
+  public async editBankRule(
+    ruleId: number,
+    editRuleDTO: IEditBankRuleDTO
+  ) {
+    const oldBankRule = await this.bankRuleModel.query()
+      .findById(ruleId)
+      .withGraphFetched('conditions')
+      .throwIfNotFound();
+
+    const tranformDTO = this.transformDTO(editRuleDTO);
+
+    return this.uow.withTransaction(async (trx) => {
+      // Triggers `onBankRuleEditing` event.
+      await this.eventPublisher.emitAsync(events.bankRules.onEditing, {
+        oldBankRule,
+        ruleId,
+        editRuleDTO,
+        trx,
+      } as IBankRuleEventEditingPayload);
+
+      // Updates the given bank rule.
+      const bankRule = await this.bankRuleModel.query(trx).upsertGraphAndFetch({
+        ...tranformDTO,
+        id: ruleId,
+      });
+      
+      // Triggers `onBankRuleEdited` event.
+      await this.eventPublisher.emitAsync(events.bankRules.onEdited, {
+        oldBankRule,
+        bankRule,
+        editRuleDTO,
+        trx,
+      } as IBankRuleEventEditedPayload);
+    });
+  }
+}

packages/server-nest/src/modules/BankRules/events/UnlinkBankRuleOnDeleteBankRule.ts

@@ -0,0 +1,23 @@
+import { IBankRuleEventDeletingPayload } from '../types';
+import { Injectable } from '@nestjs/common';
+import { RevertRecognizedTransactionsService } from '@/modules/BankingTranasctionsRegonize/commands/RevertRecognizedTransactions.service';
+import { events } from '@/common/events/events';
+import { OnEvent } from '@nestjs/event-emitter';
+
+@Injectable()
+export class UnlinkBankRuleOnDeleteBankRuleSubscriber {
+  private revertRecognizedTransactionsService: RevertRecognizedTransactionsService;
+
+  /**
+   * Unlinks the bank rule out of recognized transactions.
+   * @param {IBankRuleEventDeletingPayload} payload -
+   */
+  @OnEvent(events.bankRules.onDeleting)
+  public async unlinkBankRuleOutRecognizedTransactionsOnRuleDeleting({
+    oldBankRule,
+  }: IBankRuleEventDeletingPayload) {
+    await this.revertRecognizedTransactionsService.revertRecognizedTransactions(
+      oldBankRule.id
+    );
+  }
+}

packages/server-nest/src/modules/BankRules/models/BankRule.ts

@@ -0,0 +1,74 @@
+import { BaseModel } from '@/models/Model';
+import { Model } from 'objection';
+import { BankRuleCondition } from './BankRuleCondition';
+import { BankRuleAssignCategory, BankRuleConditionType } from '../types';
+
+export class BankRule extends BaseModel {
+  public id!: number;
+  public name!: string;
+  public order!: number;
+  public applyIfAccountId!: number;
+  public applyIfTransactionType!: string;
+  public assignCategory!: BankRuleAssignCategory;
+  public assignAccountId!: number;
+  public assignPayee!: string;
+  public assignMemo!: string;
+  public conditionsType!: BankRuleConditionType;
+
+  conditions!: BankRuleCondition[];
+
+  /**
+   * Table name
+   */
+  static get tableName() {
+    return 'bank_rules';
+  }
+
+  /**
+   * Timestamps columns.
+   */
+  get timestamps() {
+    return ['created_at', 'updated_at'];
+  }
+
+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return [];
+  }
+
+  /**
+   * Relationship mapping.
+   */
+  static get relationMappings() {
+    const { BankRuleCondition } = require('./BankRuleCondition');
+    const { Account } = require('../../Accounts/models/Account.model');
+
+    return {
+      /**
+       * Sale invoice associated entries.
+       */
+      conditions: {
+        relation: Model.HasManyRelation,
+        modelClass: BankRuleCondition,
+        join: {
+          from: 'bank_rules.id',
+          to: 'bank_rule_conditions.ruleId',
+        },
+      },
+
+      /**
+       * Bank rule may associated to the assign account.
+       */
+      assignAccount: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: Account,
+        join: {
+          from: 'bank_rules.assignAccountId',
+          to: 'accounts.id',
+        },
+      },
+    };
+  }
+}

packages/server-nest/src/modules/BankRules/models/BankRuleCondition.ts

@@ -0,0 +1,30 @@
+import { BaseModel } from '@/models/Model';
+
+export class BankRuleCondition extends BaseModel {
+  public id!: number;
+  public bankRuleId!: number;
+  public field!: string;
+  public comparator!: string;
+  public value!: string;
+
+  /**
+   * Table name.
+   */
+  static get tableName() {
+    return 'bank_rule_conditions';
+  }
+
+  /**
+   * Timestamps columns.
+   */
+  get timestamps() {
+    return [];
+  }
+
+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return [];
+  }
+}

packages/server-nest/src/modules/BankRules/queries/GetBankRule.service.ts

@@ -0,0 +1,30 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { GetBankRuleTransformer } from './GetBankRuleTransformer';
+import { TransformerInjectable } from '../../Transformer/TransformerInjectable.service';
+import { BankRule } from '../models/BankRule';
+import { GetBankRulesTransformer } from './GetBankRulesTransformer';
+
+@Injectable()
+export class GetBankRuleService {
+  constructor(
+    @Inject(BankRule.name) private bankRuleModel: typeof BankRule,
+    private transformer: TransformerInjectable,
+  ) {}
+
+  /**
+   * Retrieves the bank rule.
+   * @param {number} ruleId
+   * @returns {Promise<any>}
+   */
+  async getBankRule(ruleId: number): Promise<any> {
+    const bankRule = await this.bankRuleModel
+      .query()
+      .findById(ruleId)
+      .withGraphFetched('conditions');
+
+    return this.transformer.transform(
+      bankRule,
+      new GetBankRulesTransformer()
+    );
+  }
+}

packages/server-nest/src/modules/BankRules/queries/GetBankRuleTransformer.ts

@@ -0,0 +1,11 @@
+import { Transformer } from "@/modules/Transformer/Transformer";
+
+export class GetBankRuleTransformer extends Transformer {
+  /**
+   * Include these attributes to sale invoice object.
+   * @returns {Array}
+   */
+  public includeAttributes = (): string[] => {
+    return [];
+  };
+}

packages/server-nest/src/modules/BankRules/queries/GetBankRules.service.ts

@@ -0,0 +1,30 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { GetBankRulesTransformer } from './GetBankRulesTransformer';
+import { BankRule } from '../models/BankRule';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+
+@Injectable()
+export class GetBankRulesService {
+  constructor(
+    private transformer: TransformerInjectable,
+
+    @Inject(BankRule.name)
+    private bankRuleModel: typeof BankRule,
+  ) {}
+
+  /**
+   * Retrieves the bank rules of the given account.
+   * @returns {Promise<any>}
+   */
+  public async getBankRules(): Promise<any> {
+    const bankRule = await this.bankRuleModel
+      .query()
+      .withGraphFetched('conditions')
+      .withGraphFetched('assignAccount');
+
+    return this.transformer.transform(
+      bankRule,
+      new GetBankRulesTransformer()
+    );
+  }
+}

packages/server-nest/src/modules/BankRules/queries/GetBankRulesTransformer.ts

@@ -0,0 +1,49 @@
+import { Transformer } from '@/modules/Transformer/Transformer';
+import { getCashflowTransactionFormattedType } from '../../BankingTransactions/utils';
+
+export class GetBankRulesTransformer extends Transformer {
+  /**
+   * Include these attributes to sale invoice object.
+   * @returns {Array}
+   */
+  public includeAttributes = (): string[] => {
+    return [
+      'assignAccountName',
+      'assignCategoryFormatted',
+      'conditionsFormatted',
+    ];
+  };
+
+  /**
+   * Get the assign account name.
+   * @param bankRule
+   * @returns {string}
+   */
+  protected assignAccountName(bankRule: any) {
+    return bankRule.assignAccount.name;
+  }
+
+  /**
+   * Assigned category formatted.
+   * @returns {string}
+   */
+  protected assignCategoryFormatted(bankRule: any) {
+    return getCashflowTransactionFormattedType(bankRule.assignCategory);
+  }
+
+  /**
+   * Get the bank rule formatted conditions.
+   * @param bankRule
+   * @returns {string}
+   */
+  protected conditionsFormatted(bankRule: any) {
+    return bankRule.conditions
+      .map((condition) => {
+        const field =
+          condition.field.charAt(0).toUpperCase() + condition.field.slice(1);
+
+        return `${field} ${condition.comparator} ${condition.value}`;
+      })
+      .join(bankRule.conditionsType === 'and' ? ' and ' : ' or ');
+  }
+}

packages/server-nest/src/modules/BankRules/types.ts

@@ -0,0 +1,124 @@
+import { Knex } from 'knex';
+import { BankRule } from './models/BankRule';
+
+export enum BankRuleConditionField {
+  Amount = 'amount',
+  Description = 'description',
+  Payee = 'payee',
+}
+
+export enum BankRuleConditionComparator {
+  Contains = 'contains',
+  Equals = 'equals',
+  Equal = 'equal',
+  NotContain = 'not_contain',
+  Bigger = 'bigger',
+  BiggerOrEqual = 'bigger_or_equal',
+  Smaller = 'smaller',
+  SmallerOrEqual = 'smaller_or_equal',
+}
+
+export interface IBankRuleCondition {
+  id?: number;
+  field: BankRuleConditionField;
+  comparator: BankRuleConditionComparator;
+  value: string;
+}
+
+export enum BankRuleConditionType {
+  Or = 'or',
+  And = 'and',
+}
+
+export enum BankRuleApplyIfTransactionType {
+  Deposit = 'deposit',
+  Withdrawal = 'withdrawal',
+}
+
+// export interface BankRule {
+//   id?: number;
+//   name: string;
+//   order?: number;
+//   applyIfAccountId: number;
+//   applyIfTransactionType: BankRuleApplyIfTransactionType;
+
+//   conditionsType: BankRuleConditionType;
+//   conditions: IBankRuleCondition[];
+
+//   assignCategory: BankRuleAssignCategory;
+//   assignAccountId: number;
+//   assignPayee?: string;
+//   assignMemo?: string;
+// }
+
+export enum BankRuleAssignCategory {
+  InterestIncome = 'InterestIncome',
+  OtherIncome = 'OtherIncome',
+  Deposit = 'Deposit',
+  Expense = 'Expense',
+  OwnerDrawings = 'OwnerDrawings',
+}
+
+export interface IBankRuleConditionDTO {
+  id?: number;
+  field: string;
+  comparator:
+    | 'contains'
+    | 'equals'
+    | 'not_contains'
+    | 'equal'
+    | 'bigger'
+    | 'bigger_or_equal'
+    | 'smaller'
+    | 'smaller_or_equal';
+  value: number;
+}
+
+export interface IBankRuleCommonDTO {
+  name: string;
+  order?: number;
+  applyIfAccountId: number;
+  applyIfTransactionType: string;
+
+  conditions: IBankRuleConditionDTO[];
+
+  assignCategory: BankRuleAssignCategory;
+  assignAccountId: number;
+  assignPayee?: string;
+  assignMemo?: string;
+}
+
+export interface ICreateBankRuleDTO extends IBankRuleCommonDTO {}
+export interface IEditBankRuleDTO extends IBankRuleCommonDTO {}
+
+export interface IBankRuleEventCreatingPayload {
+  createRuleDTO: ICreateBankRuleDTO;
+  trx?: Knex.Transaction;
+}
+export interface IBankRuleEventCreatedPayload {
+  createRuleDTO: ICreateBankRuleDTO;
+  bankRule: BankRule;
+  trx?: Knex.Transaction;
+}
+
+export interface IBankRuleEventEditingPayload {
+  ruleId: number;
+  oldBankRule: any;
+  editRuleDTO: IEditBankRuleDTO;
+  trx?: Knex.Transaction;
+}
+export interface IBankRuleEventEditedPayload {
+  oldBankRule: BankRule;
+  bankRule: BankRule;
+  editRuleDTO: IEditBankRuleDTO;
+  trx?: Knex.Transaction;
+}
+
+export interface IBankRuleEventDeletingPayload {
+  oldBankRule: any;
+  trx?: Knex.Transaction;
+}
+export interface IBankRuleEventDeletedPayload {
+  ruleId: number;
+  trx?: Knex.Transaction;
+}

packages/server-nest/src/modules/BankingAccounts/BankAccounts.controller.ts

@@ -0,0 +1,27 @@
+import { Controller, Param, Post } from '@nestjs/common';
+import { BankAccountsApplication } from './BankAccountsApplication.service';
+
+@Controller('banking/accounts')
+export class BankAccountsController {
+  constructor(private bankAccountsApplication: BankAccountsApplication) {}
+
+  @Post(':id/disconnect')
+  async disconnectBankAccount(@Param('id') bankAccountId: number) {
+    return this.bankAccountsApplication.disconnectBankAccount(bankAccountId);
+  }
+
+  @Post(':id/refresh')
+  async refreshBankAccount(@Param('id') bankAccountId: number) {
+    return this.bankAccountsApplication.refreshBankAccount(bankAccountId);
+  }
+
+  @Post(':id/pause')
+  async pauseBankAccount(@Param('id') bankAccountId: number) {
+    return this.bankAccountsApplication.pauseBankAccount(bankAccountId);
+  }
+
+  @Post(':id/resume')
+  async resumeBankAccount(@Param('id') bankAccountId: number) {
+    return this.bankAccountsApplication.resumeBankAccount(bankAccountId);
+  }
+}

packages/server-nest/src/modules/BankingAccounts/BankAccounts.module.ts

@@ -0,0 +1,24 @@
+import { Module } from '@nestjs/common';
+import { BankAccountsApplication } from './BankAccountsApplication.service';
+import { DisconnectBankAccountService } from './commands/DisconnectBankAccount.service';
+import { RefreshBankAccountService } from './commands/RefreshBankAccount.service';
+import { ResumeBankAccountFeedsService } from './commands/ResumeBankAccountFeeds.service';
+import { PauseBankAccountFeeds } from './commands/PauseBankAccountFeeds.service';
+import { DeleteUncategorizedTransactionsOnAccountDeleting } from './subscribers/DeleteUncategorizedTransactionsOnAccountDeleting';
+import { DisconnectPlaidItemOnAccountDeleted } from './subscribers/DisconnectPlaidItemOnAccountDeleted';
+import { BankAccountsController } from './BankAccounts.controller';
+
+@Module({
+  imports: [
+    DisconnectBankAccountService,
+    RefreshBankAccountService,
+    ResumeBankAccountFeedsService,
+    PauseBankAccountFeeds,
+    DeleteUncategorizedTransactionsOnAccountDeleting,
+    DisconnectPlaidItemOnAccountDeleted,
+  ],
+  providers: [BankAccountsApplication],
+  exports: [BankAccountsApplication],
+  controllers: [BankAccountsController],
+})
+export class BankAccountsModule {}

packages/server-nest/src/modules/BankingAccounts/BankAccountsApplication.service.ts

@@ -0,0 +1,57 @@
+import { Injectable } from '@nestjs/common';
+import { DisconnectBankAccountService } from './commands/DisconnectBankAccount.service';
+import { RefreshBankAccountService } from './commands/RefreshBankAccount.service';
+import { ResumeBankAccountFeedsService } from './commands/ResumeBankAccountFeeds.service';
+import { PauseBankAccountFeeds } from './commands/PauseBankAccountFeeds.service';
+
+@Injectable()
+export class BankAccountsApplication {
+  constructor(
+    private disconnectBankAccountService: DisconnectBankAccountService,
+    private readonly refreshBankAccountService: RefreshBankAccountService,
+    private readonly resumeBankAccountFeedsService: ResumeBankAccountFeedsService,
+    private readonly pauseBankAccountFeedsService: PauseBankAccountFeeds,
+  ) {}
+
+  /**
+   * Disconnects the given bank account.
+   * @param {number} bankAccountId - Bank account identifier.
+   * @returns {Promise<void>}
+   */
+  async disconnectBankAccount(bankAccountId: number) {
+    return this.disconnectBankAccountService.disconnectBankAccount(
+      bankAccountId,
+    );
+  }
+
+  /**
+   * Refresh the bank transactions of the given bank account.
+   * @param {number} bankAccountId - Bank account identifier.
+   * @returns {Promise<void>}
+   */
+  async refreshBankAccount(bankAccountId: number) {
+    return this.refreshBankAccountService.refreshBankAccount(bankAccountId);
+  }
+
+  /**
+   * Pauses the feeds sync of the given bank account.
+   * @param {number} bankAccountId - Bank account identifier.
+   * @returns {Promise<void>}
+   */
+  async pauseBankAccount(bankAccountId: number) {
+    return this.pauseBankAccountFeedsService.pauseBankAccountFeeds(
+      bankAccountId,
+    );
+  }
+
+  /**
+   * Resumes the feeds sync of the given bank account.
+   * @param {number} bankAccountId - Bank account identifier.
+   * @returns {Promise<void>}
+   */
+  async resumeBankAccount(bankAccountId: number) {
+    return this.resumeBankAccountFeedsService.resumeBankAccountFeeds(
+      bankAccountId,
+    );
+  }
+}

packages/server-nest/src/modules/BankingAccounts/commands/DisconnectBankAccount.service.ts

@@ -0,0 +1,75 @@
+import { Knex } from 'knex';
+import { Inject, Injectable } from '@nestjs/common';
+import { PlaidApi } from 'plaid';
+import {
+  ERRORS,
+  IBankAccountDisconnectedEventPayload,
+  IBankAccountDisconnectingEventPayload,
+} from '../types/BankAccounts.types';
+import { ACCOUNT_TYPE } from '@/constants/accounts';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { PlaidItem } from '@/modules/BankingPlaid/models/PlaidItem';
+import { ServiceError } from '@/modules/Items/ServiceError';
+import { events } from '@/common/events/events';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+
+import { PLAID_CLIENT } from '@/modules/Plaid/Plaid.module';
+
+@Injectable()
+export class DisconnectBankAccountService {
+  constructor(
+    private eventPublisher: EventEmitter2,
+    private uow: UnitOfWork,
+
+    @Inject(Account.name) private accountModel: typeof Account,
+    @Inject(PlaidItem.name) private plaidItemModel: typeof PlaidItem,
+    @Inject(PLAID_CLIENT) private plaidClient: PlaidApi,
+  ) {}
+
+  /**
+   * Disconnects the given bank account.
+   * @param {number} bankAccountId
+   * @returns {Promise<void>}
+   */
+  public async disconnectBankAccount(bankAccountId: number) {
+    // Retrieve the bank account or throw not found error.
+    const account = await this.accountModel
+      .query()
+      .findById(bankAccountId)
+      .whereIn('account_type', [ACCOUNT_TYPE.CASH, ACCOUNT_TYPE.BANK])
+      .withGraphFetched('plaidItem')
+      .throwIfNotFound();
+
+    const oldPlaidItem = account.plaidItem;
+
+    if (!oldPlaidItem) {
+      throw new ServiceError(ERRORS.BANK_ACCOUNT_NOT_CONNECTED);
+    }
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onBankAccountDisconnecting` event.
+      await this.eventPublisher.emitAsync(events.bankAccount.onDisconnecting, {
+        bankAccountId,
+      } as IBankAccountDisconnectingEventPayload);
+
+      // Remove the Plaid item from the system.
+      await this.plaidItemModel.query(trx).findById(account.plaidItemId).delete();
+
+      // Remove the plaid item association to the bank account.
+      await this.accountModel.query(trx).findById(bankAccountId).patch({
+        plaidAccountId: null,
+        plaidItemId: null,
+        isFeedsActive: false,
+      });
+      // Remove the Plaid item.
+      await this.plaidClient.itemRemove({
+        access_token: oldPlaidItem.plaidAccessToken,
+      });
+      // Triggers `onBankAccountDisconnected` event.
+      await this.eventPublisher.emitAsync(events.bankAccount.onDisconnected, {
+        bankAccountId,
+        trx,
+      } as IBankAccountDisconnectedEventPayload);
+    });
+  }
+}

packages/server-nest/src/modules/BankingAccounts/commands/PauseBankAccountFeeds.service.ts

@@ -0,0 +1,47 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import { ERRORS } from '../types/BankAccounts.types';
+import { ServiceError } from '@/modules/Items/ServiceError';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { PlaidItem } from '@/modules/BankingPlaid/models/PlaidItem';
+
+@Injectable()
+export class PauseBankAccountFeeds {
+  constructor(
+    @Inject(Account.name) private accountModel: typeof Account,
+    @Inject(PlaidItem.name) private plaidItemModel: typeof PlaidItem,
+
+    private uow: UnitOfWork,
+  ) {}
+
+  /**
+   * Pauses the bankfeed syncing of the given bank account.
+   * @param {number} bankAccountId
+   * @returns {Promise<void>}
+   */
+  public async pauseBankAccountFeeds(bankAccountId: number) {
+    const oldAccount = await this.accountModel
+      .query()
+      .findById(bankAccountId)
+      .withGraphFetched('plaidItem')
+      .throwIfNotFound();
+
+    // Can't continue if the bank account is not connected.
+    if (!oldAccount.plaidItem) {
+      throw new ServiceError(ERRORS.BANK_ACCOUNT_NOT_CONNECTED);
+    }
+    // Cannot continue if the bank account feeds is already paused.
+    if (oldAccount.plaidItem.isPaused) {
+      throw new ServiceError(ERRORS.BANK_ACCOUNT_FEEDS_ALREADY_PAUSED);
+    }
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      await this.plaidItemModel
+        .query(trx)
+        .findById(oldAccount.plaidItem.id)
+        .patch({
+          pausedAt: new Date(),
+        });
+    });
+  }
+}

packages/server-nest/src/modules/BankingAccounts/commands/RefreshBankAccount.service.ts

@@ -0,0 +1,35 @@
+import { PlaidApi } from 'plaid';
+import { Inject, Injectable } from '@nestjs/common';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { ServiceError } from '@/modules/Items/ServiceError';
+import { PLAID_CLIENT } from '@/modules/Plaid/Plaid.module';
+import { ERRORS } from '../types/BankAccounts.types';
+
+@Injectable()
+export class RefreshBankAccountService {
+  constructor(
+    @Inject(PLAID_CLIENT) private plaidClient: PlaidApi,
+    @Inject(Account.name) private readonly accountModel: typeof Account,
+  ) {}
+
+  /**
+   * Asks Plaid to trigger syncing the given bank account.
+   * @param {number} bankAccountId - Bank account identifier.
+   * @returns {Promise<void>}
+   */
+  public async refreshBankAccount(bankAccountId: number) {
+    const bankAccount = await this.accountModel
+      .query()
+      .findById(bankAccountId)
+      .withGraphFetched('plaidItem')
+      .throwIfNotFound();
+
+    // Can't continue if the given account is not linked with Plaid item.
+    if (!bankAccount.plaidItem) {
+      throw new ServiceError(ERRORS.BANK_ACCOUNT_NOT_CONNECTED);
+    }
+    await this.plaidClient.transactionsRefresh({
+      access_token: bankAccount.plaidItem.plaidAccessToken,
+    });
+  }
+}

packages/server-nest/src/modules/BankingAccounts/commands/ResumeBankAccountFeeds.service.ts

@@ -0,0 +1,46 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import { ERRORS } from '../types/BankAccounts.types';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { PlaidItem } from '@/modules/BankingPlaid/models/PlaidItem';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { ServiceError } from '@/modules/Items/ServiceError';
+
+@Injectable()
+export class ResumeBankAccountFeedsService {
+  constructor(
+    @Inject(Account.name) private accountModel: typeof Account,
+    @Inject(PlaidItem.name) private plaidItemModel: typeof PlaidItem,
+
+    private uow: UnitOfWork,
+  ) {}
+
+  /**
+   * Resumes the bank feeds syncing of the bank account.
+   * @param {number} bankAccountId
+   * @returns {Promise<void>}
+   */
+  public async resumeBankAccountFeeds(bankAccountId: number) {
+    const oldAccount = await this.accountModel
+      .query()
+      .findById(bankAccountId)
+      .withGraphFetched('plaidItem');
+
+    // Can't continue if the bank account is not connected.
+    if (!oldAccount.plaidItem) {
+      throw new ServiceError(ERRORS.BANK_ACCOUNT_NOT_CONNECTED);
+    }
+    // Cannot continue if the bank account feeds is already paused.
+    if (!oldAccount.plaidItem.isPaused) {
+      throw new ServiceError(ERRORS.BANK_ACCOUNT_FEEDS_ALREADY_RESUMED);
+    }
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      await this.plaidItemModel
+        .query(trx)
+        .findById(oldAccount.plaidItem.id)
+        .patch({
+          pausedAt: null,
+        });
+    });
+  }
+}

packages/server-nest/src/modules/BankingAccounts/queries/GetBankAccountSummary.ts

@@ -0,0 +1,107 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+
+@Injectable()
+export class GetBankAccountSummary {
+  constructor(
+    @Inject(Account.name)
+    private readonly accountModel: typeof Account,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Retrieves the bank account meta summary
+   * @param {number} bankAccountId - The bank account id.
+   * @returns {Promise<IBankAccountSummary>}
+   */
+  public async getBankAccountSummary(bankAccountId: number) {
+    const bankAccount = await this.accountModel
+      .query()
+      .findById(bankAccountId)
+      .throwIfNotFound();
+
+    const commonQuery = (q) => {
+      // Include just the given account.
+      q.where('accountId', bankAccountId);
+
+      // Only the not excluded.
+      q.modify('notExcluded');
+
+      // Only the not categorized.
+      q.modify('notCategorized');
+    };
+
+    // Retrieves the uncategorized transactions count of the given bank account.
+    const uncategorizedTranasctionsCount =
+      await this.uncategorizedBankTransactionModel.query().onBuild((q) => {
+        commonQuery(q);
+
+        // Only the not matched bank transactions.
+        q.withGraphJoined('matchedBankTransactions');
+        q.whereNull('matchedBankTransactions.id');
+
+        // Exclude the pending transactions.
+        q.modify('notPending');
+
+        // Count the results.
+        q.count('uncategorized_cashflow_transactions.id as total');
+        q.first();
+      });
+
+    // Retrives the recognized transactions count.
+    const recognizedTransactionsCount =
+      await this.uncategorizedBankTransactionModel.query().onBuild((q) => {
+        commonQuery(q);
+
+        q.withGraphJoined('recognizedTransaction');
+        q.whereNotNull('recognizedTransaction.id');
+
+        // Exclude the pending transactions.
+        q.modify('notPending');
+
+        // Count the results.
+        q.count('uncategorized_cashflow_transactions.id as total');
+        q.first();
+      });
+    // Retrieves excluded transactions count.
+    const excludedTransactionsCount =
+      await this.uncategorizedBankTransactionModel.query().onBuild((q) => {
+        q.where('accountId', bankAccountId);
+        q.modify('excluded');
+
+        // Exclude the pending transactions.
+        q.modify('notPending');
+
+        // Count the results.
+        q.count('uncategorized_cashflow_transactions.id as total');
+        q.first();
+      });
+    // Retrieves the pending transactions count.
+    const pendingTransactionsCount =
+      await this.uncategorizedBankTransactionModel.query().onBuild((q) => {
+        q.where('accountId', bankAccountId);
+        q.modify('pending');
+
+        // Count the results.
+        q.count('uncategorized_cashflow_transactions.id as total');
+        q.first();
+      });
+
+    const totalUncategorizedTransactions =
+      uncategorizedTranasctionsCount?.total || 0;
+    const totalRecognizedTransactions = recognizedTransactionsCount?.total || 0;
+    const totalExcludedTransactions = excludedTransactionsCount?.total || 0;
+    const totalPendingTransactions = pendingTransactionsCount?.total || 0;
+
+    return {
+      name: bankAccount.name,
+      totalUncategorizedTransactions,
+      totalRecognizedTransactions,
+      totalExcludedTransactions,
+      totalPendingTransactions,
+    };
+  }
+}

packages/server-nest/src/modules/BankingAccounts/subscribers/DeleteUncategorizedTransactionsOnAccountDeleting.ts

@@ -0,0 +1,55 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { events } from '@/common/events/events';
+import { IAccountEventDeletePayload } from '@/interfaces/Account';
+import { RevertRecognizedTransactionsService } from '@/modules/BankingTranasctionsRegonize/commands/RevertRecognizedTransactions.service';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { DeleteBankRulesService } from '@/modules/BankRules/commands/DeleteBankRules.service';
+import { BankRule } from '@/modules/BankRules/models/BankRule';
+
+@Injectable()
+export class DeleteUncategorizedTransactionsOnAccountDeleting {
+  constructor(
+    private readonly deleteBankRules: DeleteBankRulesService,
+    private readonly revertRecognizedTransactins: RevertRecognizedTransactionsService,
+
+    @Inject(BankRule.name) private bankRuleModel: typeof BankRule,
+    @Inject(UncategorizedBankTransaction.name)
+    private uncategorizedCashflowTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Handles revert the recognized transactions and delete all the bank rules
+   * associated to the deleted bank account.
+   * @param {IAccountEventDeletePayload}
+   */
+  @OnEvent(events.accounts.onDelete)
+  public async handleDeleteBankRulesOnAccountDeleting({
+    oldAccount,
+    trx,
+  }: IAccountEventDeletePayload) {
+    const foundAssociatedRules = await this.bankRuleModel.query(trx).where(
+      'applyIfAccountId',
+      oldAccount.id,
+    );
+    const foundAssociatedRulesIds = foundAssociatedRules.map((rule) => rule.id);
+
+    // Revert the recognized transactions of the given bank rules.
+    await this.revertRecognizedTransactins.revertRecognizedTransactions(
+      foundAssociatedRulesIds,
+      null,
+      trx,
+    );
+    // Delete the associated uncategorized transactions.
+    await this.uncategorizedCashflowTransactionModel
+      .query(trx)
+      .where('accountId', oldAccount.id)
+      .delete();
+
+    // Delete the given bank rules.
+    await this.deleteBankRules.deleteBankRules(
+      foundAssociatedRulesIds,
+      trx,
+    );
+  }
+}

packages/server-nest/src/modules/BankingAccounts/subscribers/DisconnectPlaidItemOnAccountDeleted.ts

@@ -0,0 +1,57 @@
+import { OnEvent } from '@nestjs/event-emitter';
+import { Inject, Injectable } from '@nestjs/common';
+import { IAccountEventDeletedPayload } from '@/interfaces/Account';
+import { events } from '@/common/events/events';
+import { PlaidItem } from '@/modules/BankingPlaid/models/PlaidItem';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { PlaidApi } from 'plaid';
+import { PLAID_CLIENT } from '@/modules/Plaid/Plaid.module';
+
+@Injectable()
+export class DisconnectPlaidItemOnAccountDeleted {
+  constructor(
+    @Inject(PLAID_CLIENT) private plaidClient: PlaidApi,
+    @Inject(PlaidItem.name) private plaidItemModel: typeof PlaidItem,
+    @Inject(Account.name) private accountModel: typeof Account,
+  ) {}
+  /**
+   * Deletes Plaid item from the system and Plaid once the account deleted.
+   * @param {IAccountEventDeletedPayload} payload
+   * @returns {Promise<void>}
+   */
+  @OnEvent(events.accounts.onDeleted)
+  public async handleDisconnectPlaidItemOnAccountDelete({
+    tenantId,
+    oldAccount,
+    trx,
+  }: IAccountEventDeletedPayload) {
+    // Can't continue if the deleted account is not linked to Plaid item.
+    if (!oldAccount.plaidItemId) return;
+
+    // Retrieves the Plaid item that associated to the deleted account.
+    const oldPlaidItem = await this.plaidItemModel
+      .query(trx)
+      .findOne('plaidItemId', oldAccount.plaidItemId);
+    // Unlink the Plaid item from all account before deleting it.
+    await this.accountModel
+      .query(trx)
+      .where('plaidItemId', oldAccount.plaidItemId)
+      .patch({
+        plaidAccountId: null,
+        plaidItemId: null,
+      });
+    // Remove the Plaid item from the system.
+    await this.plaidItemModel
+      .query(trx)
+      .findOne('plaidItemId', oldAccount.plaidItemId)
+      .delete();
+
+    // Remove Plaid item once the transaction resolve.
+    if (oldPlaidItem) {
+      // Remove the Plaid item.
+      await this.plaidClient.itemRemove({
+        access_token: oldPlaidItem.plaidAccessToken,
+      });
+    }
+  }
+}

packages/server-nest/src/modules/BankingAccounts/types/BankAccounts.types.ts

@@ -0,0 +1,17 @@
+import { Knex } from 'knex';
+
+export interface IBankAccountDisconnectingEventPayload {
+  bankAccountId: number;
+  trx: Knex.Transaction;
+}
+
+export interface IBankAccountDisconnectedEventPayload {
+  bankAccountId: number;
+  trx: Knex.Transaction;
+}
+
+export const ERRORS = {
+  BANK_ACCOUNT_NOT_CONNECTED: 'BANK_ACCOUNT_NOT_CONNECTED',
+  BANK_ACCOUNT_FEEDS_ALREADY_PAUSED: 'BANK_ACCOUNT_FEEDS_ALREADY_PAUSED',
+  BANK_ACCOUNT_FEEDS_ALREADY_RESUMED: 'BANK_ACCOUNT_FEEDS_ALREADY_RESUMED',
+};

packages/server-nest/src/modules/BankingCategorize/commands/CategorizeCashflowTransaction.ts

@@ -0,0 +1,110 @@
+import { castArray } from 'lodash';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import {
+  ICashflowTransactionCategorizedPayload,
+  ICashflowTransactionUncategorizingPayload,
+  ICategorizeCashflowTransactioDTO,
+} from '../types/BankingCategorize.types';
+import {
+  transformCategorizeTransToCashflow,
+  validateUncategorizedTransactionsNotExcluded,
+} from '../../BankingTransactions/utils';
+import { CommandBankTransactionValidator } from '../../BankingTransactions/commands/CommandCasflowValidator.service';
+import { CreateBankTransactionService } from '../../BankingTransactions/commands/CreateBankTransaction.service';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class CategorizeCashflowTransaction {
+  constructor(
+    private readonly eventPublisher: EventEmitter2,
+    private readonly uow: UnitOfWork,
+    private readonly commandValidators: CommandBankTransactionValidator,
+    private readonly createBankTransaction: CreateBankTransactionService,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Categorize the given cashflow transaction.
+   * @param {ICategorizeCashflowTransactioDTO} categorizeDTO - Categorize DTO.
+   */
+  public async categorize(
+    uncategorizedTransactionId: number | Array<number>,
+    categorizeDTO: ICategorizeCashflowTransactioDTO,
+  ) {
+    const uncategorizedTransactionIds = castArray(uncategorizedTransactionId);
+
+    // Retrieves the uncategorized transaction or throw an error.
+    const oldUncategorizedTransactions =
+      await this.uncategorizedBankTransactionModel.query()
+        .whereIn('id', uncategorizedTransactionIds)
+        .throwIfNotFound();
+
+    // Validate cannot categorize excluded transaction.
+    validateUncategorizedTransactionsNotExcluded(oldUncategorizedTransactions);
+
+    // Validates the transaction shouldn't be categorized before.
+    this.commandValidators.validateTransactionsShouldNotCategorized(
+      oldUncategorizedTransactions,
+    );
+    // Validate the uncateogirzed transaction if it's deposit the transaction direction
+    // should `IN` and the same thing if it's withdrawal the direction should be OUT.
+    this.commandValidators.validateUncategorizeTransactionType(
+      oldUncategorizedTransactions,
+      categorizeDTO.transactionType,
+    );
+    // Edits the cashflow transaction under UOW env.
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onTransactionCategorizing` event.
+      await this.eventPublisher.emitAsync(
+        events.cashflow.onTransactionCategorizing,
+        {
+          // tenantId,
+          oldUncategorizedTransactions,
+          trx,
+        } as ICashflowTransactionUncategorizingPayload,
+      );
+      // Transformes the categorize DTO to the cashflow transaction.
+      const cashflowTransactionDTO = transformCategorizeTransToCashflow(
+        oldUncategorizedTransactions,
+        categorizeDTO,
+      );
+      // Creates a new cashflow transaction.
+      const cashflowTransaction =
+        await this.createBankTransaction.newCashflowTransaction(
+          cashflowTransactionDTO,
+        );
+
+      // Updates the uncategorized transaction as categorized.
+      await this.uncategorizedBankTransactionModel.query(trx)
+        .whereIn('id', uncategorizedTransactionIds)
+        .patch({
+          categorized: true,
+          categorizeRefType: 'CashflowTransaction',
+          categorizeRefId: cashflowTransaction.id,
+        });
+      // Fetch the new updated uncategorized transactions.
+      const uncategorizedTransactions =
+        await this.uncategorizedBankTransactionModel.query(trx).whereIn(
+          'id',
+          uncategorizedTransactionIds,
+        );
+      // Triggers `onCashflowTransactionCategorized` event.
+      await this.eventPublisher.emitAsync(
+        events.cashflow.onTransactionCategorized,
+        {
+          cashflowTransaction,
+          uncategorizedTransactions,
+          oldUncategorizedTransactions,
+          categorizeDTO,
+          trx,
+        } as ICashflowTransactionCategorizedPayload,
+      );
+    });
+  }
+}

packages/server-nest/src/modules/BankingCategorize/commands/CategorizeTransactionAsExpense.ts

@@ -0,0 +1,77 @@
+import {
+  CategorizeTransactionAsExpenseDTO,
+  ICashflowTransactionCategorizedPayload,
+} from '@/interfaces';
+import { Knex } from 'knex';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { Expense } from '@/modules/Expenses/models/Expense.model';
+import { BankTransaction } from '@/modules/BankingTransactions/models/BankTransaction';
+import { CreateExpense } from '@/modules/Expenses/commands/CreateExpense.service';
+import { Inject } from '@nestjs/common';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { Injectable } from '@nestjs/common';
+import { events } from '@/common/events/events';
+import { ICashflowTransactionUncategorizedPayload } from '../types/BankingCategorize.types';
+
+@Injectable()
+export class CategorizeTransactionAsExpense {
+  constructor(
+    private readonly uow: UnitOfWork,
+    private readonly eventPublisher: EventEmitter2,
+    private readonly createExpenseService: CreateExpense,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+
+    @Inject(Expense.name)
+    private readonly expenseModel: typeof Expense,
+
+    @Inject(BankTransaction.name)
+    private readonly bankTransactionModel: typeof BankTransaction,
+  ) {}
+
+  /**
+   * Categorize the transaction as expense transaction.
+   * @param {number} cashflowTransactionId
+   * @param {CategorizeTransactionAsExpenseDTO} transactionDTO
+   */
+  public async categorize(
+    cashflowTransactionId: number,
+    transactionDTO: CategorizeTransactionAsExpenseDTO,
+  ) {
+    const transaction = await this.bankTransactionModel
+      .query()
+      .findById(cashflowTransactionId)
+      .throwIfNotFound();
+
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onTransactionUncategorizing` event.
+      await this.eventPublisher.emitAsync(
+        events.cashflow.onTransactionCategorizingAsExpense,
+        {
+          trx,
+        } as ICashflowTransactionCategorizedPayload,
+      );
+      // Creates a new expense transaction.
+      const expenseTransaction = await this.createExpenseService.newExpense({});
+
+      // Updates the item on the storage and fetches the updated once.
+      const cashflowTransaction = await this.bankTransactionModel
+        .query(trx)
+        .patchAndFetchById(cashflowTransactionId, {
+          categorizeRefType: 'Expense',
+          categorizeRefId: expenseTransaction.id,
+          uncategorized: true,
+        });
+      // Triggers `onTransactionUncategorized` event.
+      await this.eventPublisher.emitAsync(
+        events.cashflow.onTransactionCategorizedAsExpense,
+        {
+          cashflowTransaction,
+          trx,
+        } as ICashflowTransactionUncategorizedPayload,
+      );
+    });
+  }
+}

packages/server-nest/src/modules/BankingCategorize/commands/CreateUncategorizedTransaction.service.ts

@@ -0,0 +1,61 @@
+import { Knex } from 'knex';
+import {
+  CreateUncategorizedTransactionDTO,
+  IUncategorizedTransactionCreatedEventPayload,
+  IUncategorizedTransactionCreatingEventPayload,
+} from '../types/BankingCategorize.types';
+import { Inject, Injectable } from '@nestjs/common';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { UncategorizedBankTransaction } from '../../BankingTransactions/models/UncategorizedBankTransaction';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class CreateUncategorizedTransactionService {
+  constructor(
+    private readonly uow: UnitOfWork,
+    private readonly eventPublisher: EventEmitter2,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransaction: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Creates an uncategorized cashflow transaction.
+   * @param {CreateUncategorizedTransactionDTO} createDTO - Create uncategorized transaction DTO.
+   * @param {Knex.Transaction} trx - Knex transaction.
+   * @returns {Promise<UncategorizedBankTransaction>}
+   */
+  public create(
+    createUncategorizedTransactionDTO: CreateUncategorizedTransactionDTO,
+    trx?: Knex.Transaction
+  ) {
+    return this.uow.withTransaction(
+      async (trx: Knex.Transaction) => {
+        await this.eventPublisher.emitAsync(
+          events.cashflow.onTransactionUncategorizedCreating,
+          {
+            createUncategorizedTransactionDTO,
+            trx,
+          } as IUncategorizedTransactionCreatingEventPayload
+        );
+
+        const uncategorizedTransaction =
+          await this.uncategorizedBankTransaction.query(trx).insertAndFetch({
+            ...createUncategorizedTransactionDTO,
+          });
+
+        await this.eventPublisher.emitAsync(
+          events.cashflow.onTransactionUncategorizedCreated,
+          {
+            uncategorizedTransaction,
+            createUncategorizedTransactionDTO,
+            trx,
+          } as IUncategorizedTransactionCreatedEventPayload
+        );
+        return uncategorizedTransaction;
+      },
+      trx
+    );
+  }
+}

packages/server-nest/src/modules/BankingCategorize/commands/UncategorizeCashflowTransaction.service.ts

@@ -0,0 +1,98 @@
+import { Knex } from 'knex';
+import {
+  ICashflowTransactionUncategorizedPayload,
+  ICashflowTransactionUncategorizingPayload,
+} from '../types/BankingCategorize.types';
+import { validateTransactionShouldBeCategorized } from '../../BankingTransactions/utils';
+import { Inject, Injectable } from '@nestjs/common';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { events } from '@/common/events/events';
+import { UncategorizedBankTransaction } from '../../BankingTransactions/models/UncategorizedBankTransaction';
+
+@Injectable()
+export class UncategorizeCashflowTransactionService {
+  constructor(
+    private readonly eventPublisher: EventEmitter2,
+    private readonly uow: UnitOfWork,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Uncategorizes the given cashflow transaction.
+   * @param {number} cashflowTransactionId - The id of the cashflow transaction to be uncategorized.
+   * @returns {Promise<Array<number>>}
+   */
+  public async uncategorize(
+    uncategorizedTransactionId: number,
+  ): Promise<Array<number>> {
+    const oldMainUncategorizedTransaction =
+      await this.uncategorizedBankTransactionModel
+        .query()
+        .findById(uncategorizedTransactionId)
+        .throwIfNotFound();
+
+    validateTransactionShouldBeCategorized(oldMainUncategorizedTransaction);
+
+    const associatedUncategorizedTransactions =
+      await this.uncategorizedBankTransactionModel
+        .query()
+        .where(
+          'categorizeRefId',
+          oldMainUncategorizedTransaction.categorizeRefId,
+        )
+        .where(
+          'categorizeRefType',
+          oldMainUncategorizedTransaction.categorizeRefType,
+        )
+        // Exclude the main transaction.
+        .whereNot('id', uncategorizedTransactionId);
+
+    const oldUncategorizedTransactions = [
+      oldMainUncategorizedTransaction,
+      ...associatedUncategorizedTransactions,
+    ];
+    const oldUncategoirzedTransactionsIds = oldUncategorizedTransactions.map(
+      (t) => t.id,
+    );
+    // Updates the transaction under UOW.
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onTransactionUncategorizing` event.
+      await this.eventPublisher.emitAsync(
+        events.cashflow.onTransactionUncategorizing,
+        {
+          uncategorizedTransactionId,
+          oldUncategorizedTransactions,
+          trx,
+        } as ICashflowTransactionUncategorizingPayload,
+      );
+      // Removes the ref relation with the related transaction.
+      await this.uncategorizedBankTransactionModel
+        .query(trx)
+        .whereIn('id', oldUncategoirzedTransactionsIds)
+        .patch({
+          categorized: false,
+          categorizeRefId: null,
+          categorizeRefType: null,
+        });
+      const uncategorizedTransactions =
+        await this.uncategorizedBankTransactionModel
+          .query(trx)
+          .whereIn('id', oldUncategoirzedTransactionsIds);
+      // Triggers `onTransactionUncategorized` event.
+      await this.eventPublisher.emitAsync(
+        events.cashflow.onTransactionUncategorized,
+        {
+          uncategorizedTransactionId,
+          oldMainUncategorizedTransaction,
+          uncategorizedTransactions,
+          oldUncategorizedTransactions,
+          trx,
+        } as ICashflowTransactionUncategorizedPayload,
+      );
+      return oldUncategoirzedTransactionsIds;
+    });
+  }
+}

packages/server-nest/src/modules/BankingCategorize/commands/UncategorizeCashflowTransactionsBulk.service.ts

@@ -0,0 +1,32 @@
+import { castArray } from 'lodash';
+import { PromisePool } from '@supercharge/promise-pool';
+import { Injectable } from '@nestjs/common';
+import { UncategorizeCashflowTransactionService } from './UncategorizeCashflowTransaction.service';
+
+@Injectable()
+export class UncategorizeCashflowTransactionsBulk {
+  constructor(
+    private readonly uncategorizeTransactionService: UncategorizeCashflowTransactionService
+  ) {}
+
+  /**
+   * Uncategorize the given bank transactions in bulk.
+   * @param {number} tenantId
+   * @param {number} uncategorizedTransactionId
+   */
+  public async uncategorizeBulk(
+    uncategorizedTransactionId: number | Array<number>
+  ) {
+    const uncategorizedTransactionIds = castArray(uncategorizedTransactionId);
+
+    const result = await PromisePool.withConcurrency(MIGRATION_CONCURRENCY)
+      .for(uncategorizedTransactionIds)
+      .process(async (_uncategorizedTransactionId: number, index, pool) => {
+        await this.uncategorizeTransactionService.uncategorize(
+          _uncategorizedTransactionId
+        );
+      });
+  }
+}
+
+const MIGRATION_CONCURRENCY = 1;

packages/server-nest/src/modules/BankingCategorize/commands/UncategorizedTransaction.transformer.ts

@@ -0,0 +1,145 @@
+import { Transformer } from "../../Transformer/Transformer";
+
+export class UncategorizedTransactionTransformer extends Transformer {
+  /**
+   * Include these attributes to sale invoice object.
+   * @returns {string[]}
+   */
+  public includeAttributes = (): string[] => {
+    return [
+      'formattedAmount',
+      'formattedDate',
+      'formattedDepositAmount',
+      'formattedWithdrawalAmount',
+
+      'assignedAccountId',
+      'assignedAccountName',
+      'assignedAccountCode',
+      'assignedPayee',
+      'assignedMemo',
+      'assignedCategory',
+      'assignedCategoryFormatted',
+    ];
+  };
+
+  /**
+   * Exclude all attributes.
+   * @returns {Array<string>}
+   */
+  public excludeAttributes = (): string[] => {
+    return ['recognizedTransaction'];
+  };
+
+  /**
+   * Formattes the transaction date.
+   * @param transaction
+   * @returns {string}
+   */
+  public formattedDate(transaction) {
+    return this.formatDate(transaction.date);
+  }
+
+  /**
+   * Formatted amount.
+   * @param transaction
+   * @returns {string}
+   */
+  public formattedAmount(transaction) {
+    return this.formatNumber(transaction.amount, {
+      currencyCode: transaction.currencyCode,
+    });
+  }
+
+  /**
+   * Formatted deposit amount.
+   * @param transaction
+   * @returns {string}
+   */
+  protected formattedDepositAmount(transaction) {
+    if (transaction.isDepositTransaction) {
+      return this.formatNumber(transaction.deposit, {
+        currencyCode: transaction.currencyCode,
+      });
+    }
+    return '';
+  }
+
+  /**
+   * Formatted withdrawal amount.
+   * @param transaction
+   * @returns {string}
+   */
+  protected formattedWithdrawalAmount(transaction) {
+    if (transaction.isWithdrawalTransaction) {
+      return this.formatNumber(transaction.withdrawal, {
+        currencyCode: transaction.currencyCode,
+      });
+    }
+    return '';
+  }
+
+  // --------------------------------------------------------
+  // # Recgonized transaction
+  // --------------------------------------------------------
+  /**
+   * Get the assigned account ID of the transaction.
+   * @param {object} transaction
+   * @returns {number}
+   */
+  public assignedAccountId(transaction: any): number {
+    return transaction.recognizedTransaction?.assignedAccountId;
+  }
+
+  /**
+   * Get the assigned account name of the transaction.
+   * @param {object} transaction
+   * @returns {string}
+   */
+  public assignedAccountName(transaction: any): string {
+    return transaction.recognizedTransaction?.assignAccount?.name;
+  }
+
+  /**
+   * Get the assigned account code of the transaction.
+   * @param {object} transaction
+   * @returns {string}
+   */
+  public assignedAccountCode(transaction: any): string {
+    return transaction.recognizedTransaction?.assignAccount?.code;
+  }
+
+  /**
+   * Get the assigned payee of the transaction.
+   * @param {object} transaction
+   * @returns {string}
+   */
+  public getAssignedPayee(transaction: any): string {
+    return transaction.recognizedTransaction?.assignedPayee;
+  }
+
+  /**
+   * Get the assigned memo of the transaction.
+   * @param {object} transaction
+   * @returns {string}
+   */
+  public assignedMemo(transaction: any): string {
+    return transaction.recognizedTransaction?.assignedMemo;
+  }
+
+  /**
+   * Get the assigned category of the transaction.
+   * @param {object} transaction
+   * @returns {string}
+   */
+  public assignedCategory(transaction: any): string {
+    return transaction.recognizedTransaction?.assignedCategory;
+  }
+
+  /**
+   * Get the assigned formatted category.
+   * @returns {string}
+   */
+  public assignedCategoryFormatted() {
+    return 'Other Income';
+  }
+}

packages/server-nest/src/modules/BankingCategorize/commands/UncategorizedTransactionsImportable.ts

@@ -0,0 +1,99 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import * as yup from 'yup';
+import uniqid from 'uniqid';
+import { Importable } from '../../Import/Importable';
+import { CreateUncategorizedTransactionService } from './CreateUncategorizedTransaction.service';
+import { ImportableContext } from '../../Import/interfaces';
+import { BankTransactionsSampleData } from '../../BankingTransactions/constants';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { CreateUncategorizedTransactionDTO } from '../types/BankingCategorize.types';
+
+@Injectable()
+export class UncategorizedTransactionsImportable extends Importable {
+  constructor(
+    private readonly createUncategorizedTransaction: CreateUncategorizedTransactionService,
+
+    @Inject(Account.name)
+    private readonly accountModel: typeof Account,
+  ) {
+    super();
+  }
+
+  /**
+   * Passing the sheet DTO to create uncategorized transaction.
+   * @param {CreateUncategorizedTransactionDTO,} createDTO 
+   * @param {Knex.Transaction} trx
+   */
+  public async importable(
+    createDTO: CreateUncategorizedTransactionDTO,
+    trx?: Knex.Transaction,
+  ) {
+    return this.createUncategorizedTransaction.create(createDTO, trx);
+  }
+
+  /**
+   * Transformes the DTO before validating and importing.
+   * @param {CreateUncategorizedTransactionDTO} createDTO
+   * @param {ImportableContext} context
+   * @returns {CreateUncategorizedTransactionDTO}
+   */
+  public transform(
+    createDTO: CreateUncategorizedTransactionDTO,
+    context?: ImportableContext,
+  ): CreateUncategorizedTransactionDTO {
+    return {
+      ...createDTO,
+      accountId: context.import.paramsParsed.accountId,
+      batch: context.import.paramsParsed.batch,
+    };
+  }
+
+  /**
+   * Sample data used to download sample sheet.
+   * @returns {Record<string, any>[]}
+   */
+  public sampleData(): Record<string, any>[] {
+    return BankTransactionsSampleData;
+  }
+
+  // ------------------
+  // # Params
+  // ------------------
+  /**
+   * Params validation schema.
+   * @returns {ValidationSchema[]}
+   */
+  public paramsValidationSchema() {
+    return yup.object().shape({
+      accountId: yup.number().required(),
+    });
+  }
+
+  /**
+   * Validates the params existance asyncly.
+   * @param {number} tenantId -
+   * @param {Record<string, any>} params -
+   */
+  public async validateParams(params: Record<string, any>): Promise<void> {
+    if (params.accountId) {
+      await this.accountModel
+        .query()
+        .findById(params.accountId)
+        .throwIfNotFound({});
+    }
+  }
+
+  /**
+   * Transforms the import params before storing them.
+   * @param {Record<string, any>} parmas
+   */
+  public transformParams(parmas: Record<string, any>) {
+    const batch = uniqid();
+
+    return {
+      ...parmas,
+      batch,
+    };
+  }
+}

packages/server-nest/src/modules/BankingCategorize/types/BankingCategorize.types.ts

@@ -0,0 +1,63 @@
+import { UncategorizedBankTransaction } from "@/modules/BankingTransactions/models/UncategorizedBankTransaction";
+import { Knex } from "knex";
+
+export interface ICashflowTransactionCategorizedPayload {
+  uncategorizedTransactions: Array<UncategorizedBankTransaction>;
+  cashflowTransaction: UncategorizedBankTransaction;
+  oldUncategorizedTransactions: Array<UncategorizedBankTransaction>;
+  categorizeDTO: any;
+  trx: Knex.Transaction;
+}
+
+export interface ICashflowTransactionUncategorizingPayload {
+  uncategorizedTransactionId: number;
+  oldUncategorizedTransactions: Array<UncategorizedBankTransaction>;
+  trx: Knex.Transaction;
+}
+
+export interface ICashflowTransactionUncategorizedPayload {
+  uncategorizedTransactionId: number;
+  uncategorizedTransactions: Array<UncategorizedBankTransaction>;
+  oldMainUncategorizedTransaction: UncategorizedBankTransaction;
+  oldUncategorizedTransactions: Array<UncategorizedBankTransaction>;
+  trx: Knex.Transaction;
+}
+
+export interface ICategorizeCashflowTransactioDTO {
+  date: Date;
+  creditAccountId: number;
+  referenceNo: string;
+  transactionNumber: string;
+  transactionType: string;
+  exchangeRate: number;
+  description: string;
+  branchId: number;
+}
+
+
+export interface IUncategorizedTransactionCreatingEventPayload {
+  tenantId: number;
+  createUncategorizedTransactionDTO: CreateUncategorizedTransactionDTO;
+  trx: Knex.Transaction;
+}
+
+export interface IUncategorizedTransactionCreatedEventPayload {
+  tenantId: number;
+  uncategorizedTransaction: any;
+  createUncategorizedTransactionDTO: CreateUncategorizedTransactionDTO;
+  trx: Knex.Transaction;
+}
+
+export interface CreateUncategorizedTransactionDTO {
+  date: Date | string;
+  accountId: number;
+  amount: number;
+  currencyCode: string;
+  payee?: string;
+  description?: string;
+  referenceNo?: string | null;
+  plaidTransactionId?: string | null;
+  pending?: boolean;
+  pendingPlaidTransactionId?: string | null;
+  batch?: string;
+}

packages/server-nest/src/modules/BankingMatching/BankingMatching.module.ts

@@ -0,0 +1,39 @@
+import { Module } from '@nestjs/common';
+import { MatchedBankTransaction } from './models/MatchedBankTransaction';
+import { RegisterTenancyModel } from '../Tenancy/TenancyModels/Tenancy.module';
+import { BankingMatchingApplication } from './BankingMatchingApplication';
+import { GetMatchedTransactions } from './queries/GetMatchedTransactions.service';
+import { UnmatchMatchedBankTransaction } from './commands/UnmatchMatchedTransaction.service';
+import { GetMatchedTransactionsByBills } from './queries/GetMatchedTransactionsByBills.service';
+import { GetMatchedTransactionsByCashflow } from './queries/GetMatchedTransactionsByCashflow';
+import { GetMatchedTransactionsByExpenses } from './queries/GetMatchedTransactionsByExpenses';
+import { GetMatchedTransactionsByInvoices } from './queries/GetMatchedTransactionsByInvoices.service';
+import { ValidateMatchingOnExpenseDeleteSubscriber } from './events/ValidateMatchingOnExpenseDelete';
+import { ValidateMatchingOnPaymentReceivedDeleteSubscriber } from './events/ValidateMatchingOnPaymentReceivedDelete';
+import { DecrementUncategorizedTransactionOnMatchingSubscriber } from './events/DecrementUncategorizedTransactionsOnMatch';
+import { ValidateMatchingOnPaymentMadeDeleteSubscriber } from './events/ValidateMatchingOnPaymentMadeDelete';
+import { ValidateMatchingOnManualJournalDeleteSubscriber } from './events/ValidateMatchingOnManualJournalDelete';
+import { ValidateMatchingOnCashflowDeleteSubscriber } from './events/ValidateMatchingOnCashflowDelete';
+
+const models = [RegisterTenancyModel(MatchedBankTransaction)];
+
+@Module({
+  providers: [
+    ...models,
+    GetMatchedTransactionsByBills,
+    GetMatchedTransactionsByCashflow,
+    GetMatchedTransactionsByExpenses,
+    GetMatchedTransactionsByInvoices,
+    BankingMatchingApplication,
+    GetMatchedTransactions,
+    UnmatchMatchedBankTransaction,
+    ValidateMatchingOnExpenseDeleteSubscriber,
+    ValidateMatchingOnPaymentReceivedDeleteSubscriber,
+    DecrementUncategorizedTransactionOnMatchingSubscriber,
+    ValidateMatchingOnPaymentMadeDeleteSubscriber,
+    ValidateMatchingOnManualJournalDeleteSubscriber,
+    ValidateMatchingOnCashflowDeleteSubscriber
+  ],
+  exports: [...models],
+})
+export class BankingMatchingModule {}

packages/server-nest/src/modules/BankingMatching/BankingMatchingApplication.ts

@@ -0,0 +1,65 @@
+import { Injectable } from '@nestjs/common';
+import { GetMatchedTransactions } from './queries/GetMatchedTransactions.service';
+import { MatchBankTransactions } from './commands/MatchTransactions';
+import { UnmatchMatchedBankTransaction } from './commands/UnmatchMatchedTransaction.service';
+import { GetMatchedTransactionsFilter, IMatchTransactionDTO } from './types';
+
+@Injectable()
+export class BankingMatchingApplication {
+  constructor(
+    private readonly getMatchedTransactionsService: GetMatchedTransactions,
+    private readonly matchTransactionService: MatchBankTransactions,
+    private readonly unmatchMatchedTransactionService: UnmatchMatchedBankTransaction
+  ) {}
+
+  /**
+   * Retrieves the matched transactions.
+   * @param {Array<number>} uncategorizedTransactionsIds - Uncategorized transactions ids.
+   * @param {GetMatchedTransactionsFilter} filter -
+   * @returns {Promise<MatchedTransactionsPOJO>}
+   */
+  public getMatchedTransactions(
+    uncategorizedTransactionsIds: Array<number>,
+    filter: GetMatchedTransactionsFilter
+  ) {
+    return this.getMatchedTransactionsService.getMatchedTransactions(
+      uncategorizedTransactionsIds,
+      filter
+    );
+  }
+
+  /**
+   * Matches the given uncategorized transaction with the given system transaction.
+   * @param {number} tenantId
+   * @param {number} uncategorizedTransactionId
+   * @param {IMatchTransactionDTO} matchTransactionsDTO
+   * @returns {Promise<void>}
+   */
+  public matchTransaction(
+    tenantId: number,
+    uncategorizedTransactionId: number | Array<number>,
+    matchedTransactions: Array<IMatchTransactionDTO>
+  ): Promise<void> {
+    return this.matchTransactionService.matchTransaction(
+      tenantId,
+      uncategorizedTransactionId,
+      matchedTransactions
+    );
+  }
+
+  /**
+   * Unmatch the given matched transaction.
+   * @param {number} tenantId
+   * @param {number} uncategorizedTransactionId
+   * @returns {Promise<void>}
+   */
+  public unmatchMatchedTransaction(
+    tenantId: number,
+    uncategorizedTransactionId: number
+  ) {
+    return this.unmatchMatchedTransactionService.unmatchMatchedTransaction(
+      tenantId,
+      uncategorizedTransactionId
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/_utils.ts

@@ -0,0 +1,64 @@
+import moment from 'moment';
+import * as R from 'ramda';
+import { isEmpty, sumBy } from 'lodash';
+import { ERRORS, MatchedTransactionPOJO } from './types';
+import { ServiceError } from '../Items/ServiceError';
+
+export const sortClosestMatchTransactions = (
+  amount: number,
+  date: Date,
+  matches: MatchedTransactionPOJO[]
+) => {
+  return R.sortWith([
+    // Sort by amount difference (closest to uncategorized transaction amount first)
+    R.ascend((match: MatchedTransactionPOJO) =>
+      Math.abs(match.amount - amount)
+    ),
+    // Sort by date difference (closest to uncategorized transaction date first)
+    R.ascend((match: MatchedTransactionPOJO) =>
+      Math.abs(moment(match.date).diff(moment(date), 'days'))
+    ),
+  ])(matches);
+};
+
+export const sumMatchTranasctions = (transactions: Array<any>) => {
+  return transactions.reduce(
+    (total, item) =>
+      total +
+      (item.transactionNormal === 'debit' ? 1 : -1) * parseFloat(item.amount),
+    0
+  );
+};
+
+export const sumUncategorizedTransactions = (
+  uncategorizedTransactions: Array<any>
+) => {
+  return sumBy(uncategorizedTransactions, 'amount');
+};
+
+export const validateUncategorizedTransactionsNotMatched = (
+  uncategorizedTransactions: any
+) => {
+  const matchedTransactions = uncategorizedTransactions.filter(
+    (trans) => !isEmpty(trans.matchedBankTransactions)
+  );
+  //
+  if (matchedTransactions.length > 0) {
+    throw new ServiceError(ERRORS.TRANSACTION_ALREADY_MATCHED, '', {
+      matchedTransactionsIds: matchedTransactions?.map((m) => m.id),
+    });
+  }
+};
+
+export const validateUncategorizedTransactionsExcluded = (
+  uncategorizedTransactions: any
+) => {
+  const excludedTransactions = uncategorizedTransactions.filter(
+    (trans) => trans.excluded
+  );
+  if (excludedTransactions.length > 0) {
+    throw new ServiceError(ERRORS.CANNOT_MATCH_EXCLUDED_TRANSACTION, '', {
+      excludedTransactionsIds: excludedTransactions.map((e) => e.id),
+    });
+  }
+};

packages/server-nest/src/modules/BankingMatching/commands/MatchTransactions.ts

@@ -0,0 +1,149 @@
+import { castArray } from 'lodash';
+import { Knex } from 'knex';
+import { Inject, Injectable } from '@nestjs/common';
+import { PromisePool } from '@supercharge/promise-pool';
+import {
+  ERRORS,
+  IBankTransactionMatchedEventPayload,
+  IBankTransactionMatchingEventPayload,
+  IMatchTransactionDTO,
+} from '../types';
+import { MatchTransactionsTypes } from './MatchTransactionsTypes';
+import {
+  sumMatchTranasctions,
+  sumUncategorizedTransactions,
+  validateUncategorizedTransactionsExcluded,
+  validateUncategorizedTransactionsNotMatched,
+} from '../_utils';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { ServiceError } from '@/modules/Items/ServiceError';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class MatchBankTransactions {
+  constructor(
+    private readonly uow: UnitOfWork,
+    private readonly eventPublisher: EventEmitter2,
+    private readonly matchedBankTransactions: MatchTransactionsTypes,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Validates the match bank transactions DTO.
+   * @param {number} uncategorizedTransactionId - Uncategorized transaction id.
+   * @param {IMatchTransactionsDTO} matchTransactionsDTO - Match transactions DTO.
+   * @returns {Promise<void>}
+   */
+  async validate(
+    uncategorizedTransactionId: number | Array<number>,
+    matchedTransactions: Array<IMatchTransactionDTO>,
+  ) {
+    const uncategorizedTransactionIds = castArray(uncategorizedTransactionId);
+
+    // Validates the uncategorized transaction existance.
+    const uncategorizedTransactions =
+      await this.uncategorizedBankTransactionModel
+        .query()
+        .whereIn('id', uncategorizedTransactionIds)
+        .withGraphFetched('matchedBankTransactions')
+        .throwIfNotFound();
+
+    // Validates the uncategorized transaction is not already matched.
+    validateUncategorizedTransactionsNotMatched(uncategorizedTransactions);
+
+    // Validate the uncategorized transaction is not excluded.
+    validateUncategorizedTransactionsExcluded(uncategorizedTransactions);
+
+    // Validates the given matched transaction.
+    const validateMatchedTransaction = async (matchedTransaction) => {
+      const getMatchedTransactionsService =
+        this.matchedBankTransactions.registry.get(
+          matchedTransaction.referenceType,
+        );
+      if (!getMatchedTransactionsService) {
+        throw new ServiceError(
+          ERRORS.RESOURCE_TYPE_MATCHING_TRANSACTION_INVALID,
+        );
+      }
+      const foundMatchedTransaction =
+        await getMatchedTransactionsService.getMatchedTransaction(
+          matchedTransaction.referenceId,
+        );
+      if (!foundMatchedTransaction) {
+        throw new ServiceError(ERRORS.RESOURCE_ID_MATCHING_TRANSACTION_INVALID);
+      }
+      return foundMatchedTransaction;
+    };
+    // Matches the given transactions under promise pool concurrency controlling.
+    const validatationResult = await PromisePool.withConcurrency(10)
+      .for(matchedTransactions)
+      .process(validateMatchedTransaction);
+
+    if (validatationResult.errors?.length > 0) {
+      const error = validatationResult.errors.map((er) => er.raw)[0];
+      throw new ServiceError(error);
+    }
+    // Calculate the total given matching transactions.
+    const totalMatchedTranasctions = sumMatchTranasctions(
+      validatationResult.results,
+    );
+    const totalUncategorizedTransactions = sumUncategorizedTransactions(
+      uncategorizedTransactions,
+    );
+    // Validates the total given matching transcations whether is not equal
+    // uncategorized transaction amount.
+    if (totalUncategorizedTransactions !== totalMatchedTranasctions) {
+      throw new ServiceError(ERRORS.TOTAL_MATCHING_TRANSACTIONS_INVALID);
+    }
+  }
+
+  /**
+   * Matches the given uncategorized transaction to the given references.
+   * @param {number} tenantId
+   * @param {number} uncategorizedTransactionId
+   * @returns {Promise<void>}
+   */
+  public async matchTransaction(
+    tenantId: number,
+    uncategorizedTransactionId: number | Array<number>,
+    matchedTransactions: Array<IMatchTransactionDTO>,
+  ): Promise<void> {
+    const uncategorizedTransactionIds = castArray(uncategorizedTransactionId);
+
+    // Validates the given matching transactions DTO.
+    await this.validate(uncategorizedTransactionIds, matchedTransactions);
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers the event `onBankTransactionMatching`.
+      await this.eventPublisher.emitAsync(events.bankMatch.onMatching, {
+        uncategorizedTransactionIds,
+        matchedTransactions,
+        trx,
+      } as IBankTransactionMatchingEventPayload);
+
+      // Matches the given transactions under promise pool concurrency controlling.
+      await PromisePool.withConcurrency(10)
+        .for(matchedTransactions)
+        .process(async (matchedTransaction) => {
+          const getMatchedTransactionsService =
+            this.matchedBankTransactions.registry.get(
+              matchedTransaction.referenceType,
+            );
+          await getMatchedTransactionsService.createMatchedTransaction(
+            uncategorizedTransactionIds,
+            matchedTransaction,
+            trx,
+          );
+        });
+      // Triggers the event `onBankTransactionMatched`.
+      await this.eventPublisher.emitAsync(events.bankMatch.onMatched, {
+        uncategorizedTransactionIds,
+        matchedTransactions,
+        trx,
+      } as IBankTransactionMatchedEventPayload);
+    });
+  }
+}

packages/server-nest/src/modules/BankingMatching/commands/MatchTransactionsTypes.ts

@@ -0,0 +1,63 @@
+import { GetMatchedTransactionsByExpenses } from '../queries/GetMatchedTransactionsByExpenses';
+import { GetMatchedTransactionsByBills } from '../queries/GetMatchedTransactionsByBills.service';
+import { GetMatchedTransactionsByManualJournals } from '../queries/GetMatchedTransactionsByManualJournals.service';
+import { MatchTransactionsTypesRegistry } from './MatchTransactionsTypesRegistry';
+import { GetMatchedTransactionsByInvoices } from '../queries/GetMatchedTransactionsByInvoices.service';
+import { GetMatchedTransactionCashflowTransformer } from '../queries/GetMatchedTransactionCashflowTransformer';
+import { GetMatchedTransactionsByCashflow } from '../queries/GetMatchedTransactionsByCashflow';
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class MatchTransactionsTypes {
+  private static registry: MatchTransactionsTypesRegistry;
+
+  /**
+   * Consttuctor method.
+   */
+  constructor() {
+    this.boot();
+  }
+
+  get registered() {
+    return [
+      { type: 'SaleInvoice', service: GetMatchedTransactionsByInvoices },
+      { type: 'Bill', service: GetMatchedTransactionsByBills },
+      { type: 'Expense', service: GetMatchedTransactionsByExpenses },
+      {
+        type: 'ManualJournal',
+        service: GetMatchedTransactionsByManualJournals,
+      },
+      {
+        type: 'CashflowTransaction',
+        service: GetMatchedTransactionsByCashflow,
+      },
+    ];
+  }
+
+  /**
+   * Importable instances.
+   */
+  private types = [];
+
+  /**
+   *
+   */
+  public get registry() {
+    return MatchTransactionsTypes.registry;
+  }
+
+  /**
+   * Boots all the registered importables.
+   */
+  public boot() {
+    if (!MatchTransactionsTypes.registry) {
+      const instance = MatchTransactionsTypesRegistry.getInstance();
+
+      this.registered.forEach((registered) => {
+        const serviceInstanace = Container.get(registered.service);
+        instance.register(registered.type, serviceInstanace);
+      });
+      MatchTransactionsTypes.registry = instance;
+    }
+  }
+}

packages/server-nest/src/modules/BankingMatching/commands/MatchTransactionsTypesRegistry.ts

@@ -0,0 +1,50 @@
+import { camelCase, upperFirst } from 'lodash';
+import { GetMatchedTransactionsByType } from '../queries/GetMatchedTransactionsByType';
+
+export class MatchTransactionsTypesRegistry {
+  private static instance: MatchTransactionsTypesRegistry;
+  private importables: Record<string, GetMatchedTransactionsByType>;
+
+  constructor() {
+    this.importables = {};
+  }
+
+  /**
+   * Gets singleton instance of registry.
+   * @returns {MatchTransactionsTypesRegistry}
+   */
+  public static getInstance(): MatchTransactionsTypesRegistry {
+    if (!MatchTransactionsTypesRegistry.instance) {
+      MatchTransactionsTypesRegistry.instance =
+        new MatchTransactionsTypesRegistry();
+    }
+    return MatchTransactionsTypesRegistry.instance;
+  }
+
+  /**
+   * Registers the given importable service.
+   * @param {string} resource
+   * @param {GetMatchedTransactionsByType} importable
+   */
+  public register(
+    resource: string,
+    importable: GetMatchedTransactionsByType
+  ): void {
+    const _resource = this.sanitizeResourceName(resource);
+    this.importables[_resource] = importable;
+  }
+
+  /**
+   * Retrieves the importable service instance of the given resource name.
+   * @param {string} name
+   * @returns {GetMatchedTransactionsByType}
+   */
+  public get(name: string): GetMatchedTransactionsByType {
+    const _name = this.sanitizeResourceName(name);
+    return this.importables[_name];
+  }
+
+  private sanitizeResourceName(resource: string) {
+    return upperFirst(camelCase(resource));
+  }
+}

packages/server-nest/src/modules/BankingMatching/commands/UnmatchMatchedTransaction.service.ts

@@ -0,0 +1,46 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { IBankTransactionUnmatchingEventPayload } from '../types';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { UnitOfWork } from '../../Tenancy/TenancyDB/UnitOfWork.service';
+import { events } from '@/common/events/events';
+import { MatchedBankTransaction } from '../models/MatchedBankTransaction';
+
+@Injectable()
+export class UnmatchMatchedBankTransaction {
+  constructor(
+    private readonly uow: UnitOfWork,
+    private readonly eventPublisher: EventEmitter2,
+
+    @Inject(MatchedBankTransaction.name)
+    private readonly matchedBankTransactionModel: typeof MatchedBankTransaction,
+  ) {}
+
+  /**
+   * Unmatch the matched the given uncategorized bank transaction.
+   * @param {number} uncategorizedTransactionId - Uncategorized transaction id.
+   * @returns {Promise<void>}
+   */
+  public unmatchMatchedTransaction(
+    tenantId: number,
+    uncategorizedTransactionId: number,
+  ): Promise<void> {
+    return this.uow.withTransaction(async (trx) => {
+      await this.eventPublisher.emitAsync(events.bankMatch.onUnmatching, {
+        tenantId,
+        uncategorizedTransactionId,
+        trx,
+      } as IBankTransactionUnmatchingEventPayload);
+
+      await this.matchedBankTransactionModel
+        .query(trx)
+        .where('uncategorizedTransactionId', uncategorizedTransactionId)
+        .delete();
+
+      await this.eventPublisher.emitAsync(events.bankMatch.onUnmatched, {
+        tenantId,
+        uncategorizedTransactionId,
+        trx,
+      } as IBankTransactionUnmatchingEventPayload);
+    });
+  }
+}

packages/server-nest/src/modules/BankingMatching/commands/ValidateTransactionsMatched.service.ts

@@ -0,0 +1,34 @@
+import { Knex } from 'knex';
+import { ERRORS } from '../types';
+import { Inject, Injectable } from '@nestjs/common';
+import { ServiceError } from '@/modules/Items/ServiceError';
+import { MatchedBankTransaction } from '../models/MatchedBankTransaction';
+
+@Injectable()
+export class ValidateTransactionMatched {
+  constructor(
+    @Inject(MatchedBankTransaction.name)
+    private readonly matchedBankTransactionModel: typeof MatchedBankTransaction,
+  ) {}
+
+  /**
+   * Validate the given transaction whether is matched with bank transactions.
+   * @param {string} referenceType - Transaction reference type.
+   * @param {number} referenceId - Transaction reference id.
+   * @returns {Promise<void>}
+   */
+  public async validateTransactionNoMatchLinking(
+    referenceType: string,
+    referenceId: number,
+    trx?: Knex.Transaction
+  ) {
+    const foundMatchedTransaction =
+      await this.matchedBankTransactionModel.query(trx).findOne({
+        referenceType,
+        referenceId,
+      });
+    if (foundMatchedTransaction) {
+      throw new ServiceError(ERRORS.CANNOT_DELETE_TRANSACTION_MATCHED);
+    }
+  }
+}

packages/server-nest/src/modules/BankingMatching/events/DecrementUncategorizedTransactionsOnMatch.ts

@@ -0,0 +1,64 @@
+import {
+  IBankTransactionMatchedEventPayload,
+  IBankTransactionUnmatchedEventPayload,
+} from '../types';
+import PromisePool from '@supercharge/promise-pool';
+import { OnEvent } from '@nestjs/event-emitter';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { Inject, Injectable } from '@nestjs/common';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class DecrementUncategorizedTransactionOnMatchingSubscriber {
+  constructor(
+    @Inject(Account.name)
+    private readonly accountModel: typeof Account,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Validates the cashflow transaction whether matched with bank transaction on deleting.
+   * @param {IManualJournalDeletingPayload}
+   */
+  @OnEvent(events.bankMatch.onMatched)
+  public async decrementUnCategorizedTransactionsOnMatching({
+    uncategorizedTransactionIds,
+    trx,
+  }: IBankTransactionMatchedEventPayload) {
+    const uncategorizedTransactions =
+      await this.uncategorizedBankTransactionModel.query().whereIn(
+        'id',
+        uncategorizedTransactionIds
+      );
+    await PromisePool.withConcurrency(1)
+      .for(uncategorizedTransactions)
+      .process(async (transaction) => {
+        await this.accountModel
+          .query(trx)
+          .findById(transaction.accountId)
+          .decrement('uncategorizedTransactions', 1);
+      });
+  }
+
+  /**
+   * Validates the cashflow transaction whether matched with bank transaction on deleting.
+   * @param {IManualJournalDeletingPayload}
+   */
+  @OnEvent(events.bankMatch.onUnmatched)
+  public async incrementUnCategorizedTransactionsOnUnmatching({
+    uncategorizedTransactionId,
+    trx,
+  }: IBankTransactionUnmatchedEventPayload) {
+    const transaction =
+      await this.uncategorizedBankTransactionModel.query().findById(
+        uncategorizedTransactionId
+      );
+    await this.accountModel
+      .query(trx)
+      .findById(transaction.accountId)
+      .increment('uncategorizedTransactions', 1);
+  }
+}

packages/server-nest/src/modules/BankingMatching/events/ValidateMatchingOnCashflowDelete.ts

@@ -0,0 +1,28 @@
+import { OnEvent } from '@nestjs/event-emitter';
+import { Injectable } from '@nestjs/common';
+import { events } from '@/common/events/events';
+import { ValidateTransactionMatched } from '../commands/ValidateTransactionsMatched.service';
+import { ICommandCashflowDeletingPayload } from '@/modules/BankingTransactions/types/BankingTransactions.types';
+
+@Injectable()
+export class ValidateMatchingOnCashflowDeleteSubscriber {
+  constructor(
+    private readonly validateNoMatchingLinkedService: ValidateTransactionMatched,
+  ) {}
+
+  /**
+   * Validates the cashflow transaction whether matched with bank transaction on deleting.
+   * @param {IManualJournalDeletingPayload}
+   */
+  @OnEvent(events.cashflow.onTransactionDeleting)
+  public async validateMatchingOnCashflowDeleting({
+    oldCashflowTransaction,
+    trx,
+  }: ICommandCashflowDeletingPayload) {
+    await this.validateNoMatchingLinkedService.validateTransactionNoMatchLinking(
+      'CashflowTransaction',
+      oldCashflowTransaction.id,
+      trx,
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/events/ValidateMatchingOnExpenseDelete.ts

@@ -0,0 +1,28 @@
+import { Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { ValidateTransactionMatched } from '../commands/ValidateTransactionsMatched.service';
+import { IExpenseEventDeletePayload } from '@/modules/Expenses/interfaces/Expenses.interface';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class ValidateMatchingOnExpenseDeleteSubscriber {
+  constructor(
+    private readonly validateNoMatchingLinkedService: ValidateTransactionMatched,
+  ) {}
+
+  /**
+   * Validates the expense transaction whether matched with bank transaction on deleting.
+   * @param {IExpenseEventDeletePayload}
+   */
+  @OnEvent(events.expenses.onDeleting)
+  public async validateMatchingOnExpenseDeleting({
+    oldExpense,
+    trx,
+  }: IExpenseEventDeletePayload) {
+    await this.validateNoMatchingLinkedService.validateTransactionNoMatchLinking(
+      'Expense',
+      oldExpense.id,
+      trx,
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/events/ValidateMatchingOnManualJournalDelete.ts

@@ -0,0 +1,28 @@
+import { Injectable } from '@nestjs/common';
+import { ValidateTransactionMatched } from '../commands/ValidateTransactionsMatched.service';
+import { OnEvent } from '@nestjs/event-emitter';
+import { IManualJournalDeletingPayload } from '@/modules/ManualJournals/types/ManualJournals.types';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class ValidateMatchingOnManualJournalDeleteSubscriber {
+  constructor(
+    private readonly validateNoMatchingLinkedService: ValidateTransactionMatched,
+  ) {}
+
+  /**
+   * Validates the manual journal transaction whether matched with bank transaction on deleting.
+   * @param {IManualJournalDeletingPayload}
+   */
+  @OnEvent(events.manualJournals.onDeleting)
+  public async validateMatchingOnManualJournalDeleting({
+    oldManualJournal,
+    trx,
+  }: IManualJournalDeletingPayload) {
+    await this.validateNoMatchingLinkedService.validateTransactionNoMatchLinking(
+      'ManualJournal',
+      oldManualJournal.id,
+      trx,
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/events/ValidateMatchingOnPaymentMadeDelete.ts

@@ -0,0 +1,28 @@
+import { Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { ValidateTransactionMatched } from '../commands/ValidateTransactionsMatched.service';
+import { IBillPaymentEventDeletedPayload } from '@/modules/BillPayments/types/BillPayments.types';
+import { events } from '@/common/events/events';
+
+@Injectable()
+export class ValidateMatchingOnPaymentMadeDeleteSubscriber {
+  constructor(
+    private readonly validateNoMatchingLinkedService: ValidateTransactionMatched,
+  ) {}
+
+  /**
+   * Validates the payment made transaction whether matched with bank transaction on deleting.
+   * @param {IPaymentReceivedDeletedPayload}
+   */
+  @OnEvent(events.billPayment.onDeleting)
+  public async validateMatchingOnPaymentMadeDeleting({
+    oldBillPayment,
+    trx,
+  }: IBillPaymentEventDeletedPayload) {
+    await this.validateNoMatchingLinkedService.validateTransactionNoMatchLinking(
+      'PaymentMade',
+      oldBillPayment.id,
+      trx,
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/events/ValidateMatchingOnPaymentReceivedDelete.ts

@@ -0,0 +1,28 @@
+import { Injectable } from '@nestjs/common';
+import { ValidateTransactionMatched } from '../commands/ValidateTransactionsMatched.service';
+import { OnEvent } from '@nestjs/event-emitter';
+import { events } from '@/common/events/events';
+import { IPaymentReceivedDeletedPayload } from '@/modules/PaymentReceived/types/PaymentReceived.types';
+
+@Injectable()
+export class ValidateMatchingOnPaymentReceivedDeleteSubscriber {
+  constructor(
+    private readonly validateNoMatchingLinkedService: ValidateTransactionMatched,
+  ) {}
+
+  /**
+   * Validates the payment received transaction whether matched with bank transaction on deleting.
+   * @param {IPaymentReceivedDeletedPayload}
+   */
+  @OnEvent(events.paymentReceive.onDeleting)
+  public async validateMatchingOnPaymentReceivedDeleting({
+    oldPaymentReceive,
+    trx,
+  }: IPaymentReceivedDeletedPayload) {
+    await this.validateNoMatchingLinkedService.validateTransactionNoMatchLinking(
+      'PaymentReceive',
+      oldPaymentReceive.id,
+      trx,
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/models/MatchedBankTransaction.ts

@@ -0,0 +1,36 @@
+import { BaseModel } from '@/models/Model';
+
+export class MatchedBankTransaction extends BaseModel {
+  public referenceId!: number;
+  public referenceType!: string;
+  public uncategorizedTransactionId!: number;
+
+
+  /**
+   * Table name.
+   */
+  static get tableName() {
+    return 'matched_bank_transactions';
+  }
+
+  /**
+   * Timestamps columns.
+   */
+  get timestamps() {
+    return ['createdAt', 'updatedAt'];
+  }
+
+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return [];
+  }
+
+  /**
+   * Relationship mapping.
+   */
+  static get relationMappings() {
+    return {};
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionBillsTransformer.ts

@@ -0,0 +1,131 @@
+import { Transformer } from "@/modules/Transformer/Transformer";
+
+export class GetMatchedTransactionBillsTransformer extends Transformer {
+  /**
+   * Include these attributes to sale credit note object.
+   * @returns {Array}
+   */
+  public includeAttributes = (): string[] => {
+    return [
+      'referenceNo',
+      'amount',
+      'amountFormatted',
+      'transactionNo',
+      'date',
+      'dateFormatted',
+      'transactionId',
+      'transactionNo',
+      'transactionType',
+      'transsactionTypeFormatted',
+      'transactionNormal',
+      'referenceId',
+      'referenceType',
+    ];
+  };
+
+  /**
+   * Exclude all attributes.
+   * @returns {Array<string>}
+   */
+  public excludeAttributes = (): string[] => {
+    return ['*'];
+  };
+
+  /**
+   * Retrieve the reference number of the bill.
+   * @param {Object} bill - The bill object.
+   * @returns {string}
+   */
+  protected referenceNo(bill) {
+    return bill.referenceNo;
+  }
+
+  /**
+   * Retrieve the amount of the bill.
+   * @param {Object} bill - The bill object.
+   * @returns {number}
+   */
+  protected amount(bill) {
+    return bill.amount;
+  }
+
+  /**
+   * Retrieve the formatted amount of the bill.
+   * @param {Object} bill - The bill object.
+   * @returns {string}
+   */
+  protected amountFormatted(bill) {
+    return this.formatNumber(bill.amount, {
+      currencyCode: bill.currencyCode,
+      money: true,
+    });
+  }
+
+  /**
+   * Retrieve the date of the bill.
+   * @param {Object} bill - The bill object.
+   * @returns {string}
+   */
+  protected date(bill) {
+    return bill.billDate;
+  }
+
+  /**
+   * Retrieve the formatted date of the bill.
+   * @param {Object} bill - The bill object.
+   * @returns {string}
+   */
+  protected dateFormatted(bill) {
+    return this.formatDate(bill.billDate);
+  }
+
+  /**
+   * Retrieve the transcation id of the bill.
+   * @param {Object} bill - The bill object.
+   * @returns {number}
+   */
+  protected transactionId(bill) {
+    return bill.id;
+  }
+
+  /**
+   * Retrieve the manual journal transaction type.
+   * @returns {string}
+   */
+  protected transactionType() {
+    return 'Bill';
+  }
+
+  /**
+   * Retrieves the manual journal formatted transaction type.
+   * @returns {string}
+   */
+  protected transsactionTypeFormatted() {
+    return 'Bill';
+  }
+
+  /**
+   * Retrieves the bill transaction normal (debit or credit).
+   * @returns {string}
+   */
+  protected transactionNormal() {
+    return 'credit';
+  }
+
+  /**
+   * Retrieve the match transaction reference id.
+   * @param bill
+   * @returns {number}
+   */
+  protected referenceId(bill) {
+    return bill.id;
+  }
+
+  /**
+   * Retrieve the match transaction referenece type.
+   * @returns {string}
+   */
+  protected referenceType() {
+    return 'Bill';
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionCashflowTransformer.ts

@@ -0,0 +1,142 @@
+import { Transformer } from "@/modules/Transformer/Transformer";
+
+export class GetMatchedTransactionCashflowTransformer extends Transformer {
+  /**
+   * Include these attributes to sale credit note object.
+   * @returns {Array}
+   */
+  public includeAttributes = (): string[] => {
+    return [
+      'referenceNo',
+      'amount',
+      'amountFormatted',
+      'transactionNo',
+      'date',
+      'dateFormatted',
+      'transactionId',
+      'transactionNo',
+      'transactionType',
+      'transsactionTypeFormatted',
+      'transactionNormal',
+      'referenceId',
+      'referenceType',
+    ];
+  };
+
+  /**
+   * Exclude all attributes.
+   * @returns {Array<string>}
+   */
+  public excludeAttributes = (): string[] => {
+    return ['*'];
+  };
+
+  /**
+   * Retrieve the invoice reference number.
+   * @returns {string}
+   */
+  protected referenceNo(invoice) {
+    return invoice.referenceNo;
+  }
+
+  /**
+   * Retrieve the transaction amount.
+   * @param transaction
+   * @returns {number}
+   */
+  protected amount(transaction) {
+    return transaction.amount;
+  }
+
+  /**
+   * Retrieve the transaction formatted amount.
+   * @param transaction
+   * @returns {string}
+   */
+  protected amountFormatted(transaction) {
+    return this.formatNumber(transaction.amount, {
+      currencyCode: transaction.currencyCode,
+      money: true,
+    });
+  }
+
+  /**
+   * Retrieve the date of the invoice.
+   * @param invoice
+   * @returns {Date}
+   */
+  protected date(transaction) {
+    return transaction.date;
+  }
+
+  /**
+   * Format the date of the invoice.
+   * @param invoice
+   * @returns {string}
+   */
+  protected dateFormatted(transaction) {
+    return this.formatDate(transaction.date);
+  }
+
+  /**
+   * Retrieve the transaction ID of the invoice.
+   * @param invoice
+   * @returns {number}
+   */
+  protected transactionId(transaction) {
+    return transaction.id;
+  }
+
+  /**
+   * Retrieve the invoice transaction number.
+   * @param invoice
+   * @returns {string}
+   */
+  protected transactionNo(transaction) {
+    return transaction.transactionNumber;
+  }
+
+  /**
+   * Retrieve the invoice transaction type.
+   * @param invoice
+   * @returns {String}
+   */
+  protected transactionType(transaction) {
+    return transaction.transactionType;
+  }
+
+  /**
+   * Retrieve the invoice formatted transaction type.
+   * @param invoice
+   * @returns {string}
+   */
+  protected transsactionTypeFormatted(transaction) {
+    return transaction.transactionTypeFormatted;
+  }
+
+  /**
+   * Retrieve the cashflow transaction normal (credit or debit).
+   * @param transaction
+   * @returns {string}
+   */
+  protected transactionNormal(transaction) {
+    return transaction.isCashCredit ? 'credit' : 'debit';
+  }
+
+  /**
+   * Retrieves the cashflow transaction reference id.
+   * @param transaction
+   * @returns {number}
+   */
+  protected referenceId(transaction) {
+    return transaction.id;
+  }
+
+  /**
+   * Retrieves the cashflow transaction reference type.
+   * @returns {string}
+   */
+  protected referenceType() {
+    return 'CashflowTransaction';
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionExpensesTransformer.ts

@@ -0,0 +1,142 @@
+import { Transformer } from "@/modules/Transformer/Transformer";
+
+export class GetMatchedTransactionExpensesTransformer extends Transformer {
+  /**
+   * Include these attributes to sale credit note object.
+   * @returns {Array}
+   */
+  public includeAttributes = (): string[] => {
+    return [
+      'referenceNo',
+      'amount',
+      'amountFormatted',
+      'transactionNo',
+      'date',
+      'dateFormatted',
+      'transactionId',
+      'transactionNo',
+      'transactionType',
+      'transsactionTypeFormatted',
+      'transactionNormal',
+      'referenceType',
+      'referenceId',
+    ];
+  };
+
+  /**
+   * Exclude all attributes.
+   * @returns {Array<string>}
+   */
+  public excludeAttributes = (): string[] => {
+    return ['*'];
+  };
+
+  /**
+   * Retrieves the expense reference number.
+   * @param expense
+   * @returns {string}
+   */
+  protected referenceNo(expense) {
+    return expense.referenceNo;
+  }
+
+  /**
+   * Retrieves the expense amount.
+   * @param expense
+   * @returns {number}
+   */
+  protected amount(expense) {
+    return expense.totalAmount;
+  }
+
+  /**
+   * Formats the amount of the expense.
+   * @param expense
+   * @returns {string}
+   */
+  protected amountFormatted(expense) {
+    return this.formatNumber(expense.totalAmount, {
+      currencyCode: expense.currencyCode,
+      money: true,
+    });
+  }
+
+  /**
+   * Retrieves the date of the expense.
+   * @param expense
+   * @returns {Date}
+   */
+  protected date(expense) {
+    return expense.paymentDate;
+  }
+
+  /**
+   * Formats the date of the expense.
+   * @param expense
+   * @returns {string}
+   */
+  protected dateFormatted(expense) {
+    return this.formatDate(expense.paymentDate);
+  }
+
+  /**
+   * Retrieves the transaction ID of the expense.
+   * @param expense
+   * @returns {number}
+   */
+  protected transactionId(expense) {
+    return expense.id;
+  }
+
+  /**
+   * Retrieves the expense transaction number.
+   * @param expense
+   * @returns {string}
+   */
+  protected transactionNo(expense) {
+    return expense.expenseNo;
+  }
+
+  /**
+   * Retrieves the expense transaction type.
+   * @param expense
+   * @returns {String}
+   */
+  protected transactionType() {
+    return 'Expense';
+  }
+
+  /**
+   * Retrieves the formatted transaction type of the expense.
+   * @param expense
+   * @returns {string}
+   */
+  protected transsactionTypeFormatted() {
+    return 'Expense';
+  }
+
+  /**
+   * Retrieve the expense transaction normal (credit or debit).
+   * @returns {string}
+   */
+  protected transactionNormal() {
+    return 'credit';
+  }
+
+  /**
+   * Retrieve the transaction reference type.
+   * @returns {string}
+   */
+  protected referenceType() {
+    return 'Expense';
+  }
+
+  /**
+   * Retrieve the transaction reference id.
+   * @param transaction
+   * @returns {number}
+   */
+  protected referenceId(transaction) {
+    return transaction.id;
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionInvoicesTransformer.ts

@@ -0,0 +1,138 @@
+import { Transformer } from "@/modules/Transformer/Transformer";
+
+export class GetMatchedTransactionInvoicesTransformer extends Transformer {
+  /**
+   * Include these attributes to sale credit note object.
+   * @returns {Array}
+   */
+  public includeAttributes = (): string[] => {
+    return [
+      'referenceNo',
+      'amount',
+      'amountFormatted',
+      'transactionNo',
+      'date',
+      'dateFormatted',
+      'transactionId',
+      'transactionNo',
+      'transactionType',
+      'transsactionTypeFormatted',
+      'transactionNormal',
+      'referenceType',
+      'referenceId'
+    ];
+  };
+
+  /**
+   * Exclude all attributes.
+   * @returns {Array<string>}
+   */
+  public excludeAttributes = (): string[] => {
+    return ['*'];
+  };
+
+  /**
+   * Retrieve the invoice reference number.
+   * @returns {string}
+   */
+  protected referenceNo(invoice) {
+    return invoice.referenceNo;
+  }
+
+  /**
+   * Retrieve the invoice amount.
+   * @param invoice
+   * @returns {number}
+   */
+  protected amount(invoice) {
+    return invoice.dueAmount;
+  }
+  /**
+   * Format the amount of the invoice.
+   * @param invoice
+   * @returns {string}
+   */
+  protected amountFormatted(invoice) {
+    return this.formatNumber(invoice.dueAmount, {
+      currencyCode: invoice.currencyCode,
+      money: true,
+    });
+  }
+
+  /**
+   * Retrieve the date of the invoice.
+   * @param invoice
+   * @returns {Date}
+   */
+  protected date(invoice) {
+    return invoice.invoiceDate;
+  }
+
+  /**
+   * Format the date of the invoice.
+   * @param invoice
+   * @returns {string}
+   */
+  protected dateFormatted(invoice) {
+    return this.formatDate(invoice.invoiceDate);
+  }
+
+  /**
+   * Retrieve the transaction ID of the invoice.
+   * @param invoice
+   * @returns {number}
+   */
+  protected transactionId(invoice) {
+    return invoice.id;
+  }
+  /**
+   * Retrieve the invoice transaction number.
+   * @param invoice
+   * @returns {string}
+   */
+  protected transactionNo(invoice) {
+    return invoice.invoiceNo;
+  }
+
+  /**
+   * Retrieve the invoice transaction type.
+   * @param invoice
+   * @returns {String}
+   */
+  protected transactionType(invoice) {
+    return 'SaleInvoice';
+  }
+
+  /**
+   * Retrieve the invoice formatted transaction type.
+   * @param invoice
+   * @returns {string}
+   */
+  protected transsactionTypeFormatted(invoice) {
+    return 'Sale invoice';
+  }
+
+  /**
+   * Retrieve the transaction normal of invoice (credit or debit).
+   * @returns {string}
+   */
+  protected transactionNormal() {
+    return 'debit';
+  }
+
+  /**
+   * Retrieve the transaction reference type.
+   * @returns {string}
+   */  protected referenceType() {
+    return 'SaleInvoice';
+  }
+
+  /**
+   * Retrieve the transaction reference id.
+   * @param transaction 
+   * @returns {number}
+   */
+  protected referenceId(transaction) {
+    return transaction.id;
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionManualJournalsTransformer.ts

@@ -0,0 +1,149 @@
+import { sumBy } from 'lodash';
+import { AccountNormal } from '@/interfaces/Account';
+import { Transformer } from '@/modules/Transformer/Transformer';
+
+export class GetMatchedTransactionManualJournalsTransformer extends Transformer {
+  /**
+   * Include these attributes to sale credit note object.
+   * @returns {Array}
+   */
+  public includeAttributes = (): string[] => {
+    return [
+      'referenceNo',
+      'amount',
+      'amountFormatted',
+      'transactionNo',
+      'date',
+      'dateFormatted',
+      'transactionId',
+      'transactionNo',
+      'transactionType',
+      'transsactionTypeFormatted',
+      'transactionNormal',
+      'referenceType',
+      'referenceId',
+    ];
+  };
+
+  /**
+   * Exclude all attributes.
+   * @returns {Array<string>}
+   */
+  public excludeAttributes = (): string[] => {
+    return ['*'];
+  };
+
+  /**
+   * Retrieves the manual journal reference no.
+   * @param manualJournal
+   * @returns {string}
+   */
+  protected referenceNo(manualJournal) {
+    return manualJournal.referenceNo;
+  }
+
+  protected total(manualJournal) {
+    const credit = sumBy(manualJournal?.entries, 'credit');
+    const debit = sumBy(manualJournal?.entries, 'debit');
+
+    return debit - credit;
+  }
+
+  /**
+   * Retrieves the manual journal amount.
+   * @param manualJournal
+   * @returns {number}
+   */
+  protected amount(manualJournal) {
+    return Math.abs(this.total(manualJournal));
+  }
+
+  /**
+   * Retrieves the manual journal formatted amount.
+   * @param manualJournal
+   * @returns {string}
+   */
+  protected amountFormatted(manualJournal) {
+    return this.formatNumber(manualJournal.amount, {
+      currencyCode: manualJournal.currencyCode,
+      money: true,
+    });
+  }
+
+  /**
+   * Retreives the manual journal date.
+   * @param manualJournal
+   * @returns {Date}
+   */
+  protected date(manualJournal) {
+    return manualJournal.date;
+  }
+
+  /**
+   * Retrieves the manual journal formatted date.
+   * @param manualJournal
+   * @returns {string}
+   */
+  protected dateFormatted(manualJournal) {
+    return this.formatDate(manualJournal.date);
+  }
+
+  /**
+   * Retrieve the manual journal transaction id.
+   * @returns {number}
+   */
+  protected transactionId(manualJournal) {
+    return manualJournal.id;
+  }
+
+  /**
+   * Retrieve the manual journal transaction number.
+   * @param manualJournal
+   */
+  protected transactionNo(manualJournal) {
+    return manualJournal.journalNumber;
+  }
+
+  /**
+   * Retrieve the manual journal transaction type.
+   * @returns {string}
+   */
+  protected transactionType() {
+    return 'ManualJournal';
+  }
+
+  /**
+   * Retrieves the manual journal formatted transaction type.
+   * @returns {string}
+   */
+  protected transsactionTypeFormatted() {
+    return 'Manual Journal';
+  }
+
+  /**
+   * Retrieve the manual journal transaction normal (credit or debit).
+   * @returns {string}
+   */
+  protected transactionNormal(transaction) {
+    const amount = this.total(transaction);
+
+    return amount >= 0 ? AccountNormal.DEBIT : AccountNormal.CREDIT;
+  }
+
+  /**
+   * Retrieve the manual journal reference type.
+   * @returns {string}
+   */
+  protected referenceType() {
+    return 'ManualJournal';
+  }
+
+  /**
+   * Retrieves the manual journal reference id.
+   * @param transaction
+   * @returns {number}
+   */
+  protected referenceId(transaction) {
+    return transaction.id;
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactions.service.ts

@@ -0,0 +1,107 @@
+import * as R from 'ramda';
+import moment from 'moment';
+import { first, sumBy } from 'lodash';
+import { PromisePool } from '@supercharge/promise-pool';
+import { Inject, Injectable } from '@nestjs/common';
+import { GetMatchedTransactionsFilter, MatchedTransactionsPOJO } from '../types';
+import { GetMatchedTransactionsByExpenses } from './GetMatchedTransactionsByExpenses';
+import { GetMatchedTransactionsByBills } from './GetMatchedTransactionsByBills.service';
+import { GetMatchedTransactionsByManualJournals } from './GetMatchedTransactionsByManualJournals.service';
+import { GetMatchedTransactionsByCashflow } from './GetMatchedTransactionsByCashflow';
+import { GetMatchedTransactionsByInvoices } from './GetMatchedTransactionsByInvoices.service';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { sortClosestMatchTransactions } from '../_utils';
+
+@Injectable()
+export class GetMatchedTransactions {
+  constructor(
+    private readonly getMatchedInvoicesService: GetMatchedTransactionsByInvoices,
+    private readonly getMatchedBillsService: GetMatchedTransactionsByBills,
+    private readonly getMatchedManualJournalService: GetMatchedTransactionsByManualJournals,
+    private readonly getMatchedExpensesService: GetMatchedTransactionsByExpenses,
+    private readonly getMatchedCashflowService: GetMatchedTransactionsByCashflow,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Registered matched transactions types.
+   */
+  get registered() {
+    return [
+      { type: 'SaleInvoice', service: this.getMatchedInvoicesService },
+      { type: 'Bill', service: this.getMatchedBillsService },
+      { type: 'Expense', service: this.getMatchedExpensesService },
+      { type: 'ManualJournal', service: this.getMatchedManualJournalService },
+      { type: 'Cashflow', service: this.getMatchedCashflowService },
+    ];
+  }
+
+  /**
+   * Retrieves the matched transactions.
+   * @param {Array<number>} uncategorizedTransactionIds - Uncategorized transactions ids.
+   * @param {GetMatchedTransactionsFilter} filter -
+   * @returns {Promise<MatchedTransactionsPOJO>}
+   */
+  public async getMatchedTransactions(
+    uncategorizedTransactionIds: Array<number>,
+    filter: GetMatchedTransactionsFilter
+  ): Promise<MatchedTransactionsPOJO> {
+    const uncategorizedTransactions =
+      await this.uncategorizedBankTransactionModel.query()
+        .whereIn('id', uncategorizedTransactionIds)
+        .throwIfNotFound();
+
+    const totalPending = sumBy(uncategorizedTransactions, 'amount');
+
+    const filtered = filter.transactionType
+      ? this.registered.filter((item) => item.type === filter.transactionType)
+      : this.registered;
+
+    const matchedTransactions = await PromisePool.withConcurrency(2)
+      .for(filtered)
+      .process(async ({ type, service }) => {
+        return service.getMatchedTransactions(filter);
+      });
+    const { perfectMatches, possibleMatches } = this.groupMatchedResults(
+      uncategorizedTransactions,
+      matchedTransactions
+    );
+    return {
+      perfectMatches,
+      possibleMatches,
+      totalPending,
+    };
+  }
+
+  /**
+   * Groups the given results for getting perfect and possible matches
+   * based on the given uncategorized transaction.
+   * @param uncategorizedTransaction
+   * @param matchedTransactions
+   * @returns {MatchedTransactionsPOJO}
+   */
+  private groupMatchedResults(
+    uncategorizedTransactions: Array<any>,
+    matchedTransactions
+  ): MatchedTransactionsPOJO {
+    const results = R.compose(R.flatten)(matchedTransactions?.results);
+
+    const firstUncategorized = first(uncategorizedTransactions);
+    const amount = sumBy(uncategorizedTransactions, 'amount');
+    const date = firstUncategorized.date;
+
+    // Sort the results based on amount, date, and transaction type
+    const closestResullts = sortClosestMatchTransactions(amount, date, results);
+    const perfectMatches = R.filter(
+      (match) =>
+        match.amount === amount && moment(match.date).isSame(date, 'day'),
+      closestResullts
+    );
+    const possibleMatches = R.difference(closestResullts, perfectMatches);
+    const totalPending = sumBy(uncategorizedTransactions, 'amount');
+
+    return { perfectMatches, possibleMatches, totalPending };
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionsByBills.service.ts

@@ -0,0 +1,139 @@
+import { initialize } from 'objection';
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import { first } from 'lodash';
+import { GetMatchedTransactionBillsTransformer } from './GetMatchedTransactionBillsTransformer';
+import {
+  GetMatchedTransactionsFilter,
+  IMatchTransactionDTO,
+  MatchedTransactionPOJO,
+} from '../types';
+import { GetMatchedTransactionsByType } from './GetMatchedTransactionsByType';
+import { CreateBillPaymentService } from '@/modules/BillPayments/commands/CreateBillPayment.service';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+import { IBillPaymentDTO } from '@/modules/BillPayments/types/BillPayments.types';
+import { Bill } from '@/modules/Bills/models/Bill';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+
+@Injectable()
+export class GetMatchedTransactionsByBills extends GetMatchedTransactionsByType {
+  constructor(
+    private readonly createPaymentMadeService: CreateBillPaymentService,
+    private readonly transformer: TransformerInjectable,
+
+    @Inject(Bill.name)
+    private readonly billModel: typeof Bill,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {
+    super();
+  }
+
+  /**
+   * Retrieves the matched transactions.
+   * @param {number} tenantId -
+   * @param {GetMatchedTransactionsFilter} filter -
+   */
+  public async getMatchedTransactions(
+    filter: GetMatchedTransactionsFilter,
+  ) {
+    // Retrieves the bill matches.
+    const bills = await Bill.query().onBuild((q) => {
+      q.withGraphJoined('matchedBankTransaction');
+      q.whereNull('matchedBankTransaction.id');
+      q.modify('published');
+
+      if (filter.fromDate) {
+        q.where('billDate', '>=', filter.fromDate);
+      }
+      if (filter.toDate) {
+        q.where('billDate', '<=', filter.toDate);
+      }
+      q.orderBy('billDate', 'DESC');
+    });
+
+    return this.transformer.transform(
+      bills,
+      new GetMatchedTransactionBillsTransformer(),
+    );
+  }
+
+  /**
+   * Retrieves the given bill matched transaction.
+   * @param {number} tenantId
+   * @param {number} transactionId
+   * @returns {Promise<MatchedTransactionPOJO>}
+   */
+  public async getMatchedTransaction(
+    transactionId: number,
+  ): Promise<MatchedTransactionPOJO> {
+    const bill = await this.billModel
+      .query()
+      .findById(transactionId)
+      .throwIfNotFound();
+
+    return this.transformer.transform(
+      bill,
+      new GetMatchedTransactionBillsTransformer(),
+    );
+  }
+
+  /**
+   * Creates the common matched transaction.
+   * @param {number} tenantId
+   * @param {Array<number>} uncategorizedTransactionIds
+   * @param {IMatchTransactionDTO} matchTransactionDTO
+   * @param {Knex.Transaction} trx
+   */
+  public async createMatchedTransaction(
+    uncategorizedTransactionIds: Array<number>,
+    matchTransactionDTO: IMatchTransactionDTO,
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    await super.createMatchedTransaction(
+      uncategorizedTransactionIds,
+      matchTransactionDTO,
+      trx,
+    );
+    const uncategorizedTransactionId = first(uncategorizedTransactionIds);
+    const uncategorizedTransaction =
+      await this.uncategorizedBankTransactionModel
+        .query(trx)
+        .findById(uncategorizedTransactionId)
+        .throwIfNotFound();
+
+    const bill = await this.billModel
+      .query(trx)
+      .findById(matchTransactionDTO.referenceId)
+      .throwIfNotFound();
+
+    const createPaymentMadeDTO: IBillPaymentDTO = {
+      vendorId: bill.vendorId,
+      paymentAccountId: uncategorizedTransaction.accountId,
+      paymentDate: uncategorizedTransaction.date,
+      exchangeRate: 1,
+      entries: [
+        {
+          paymentAmount: bill.dueAmount,
+          billId: bill.id,
+        },
+      ],
+      branchId: bill.branchId,
+    };
+    // Create a new bill payment associated to the matched bill.
+    const billPayment = await this.createPaymentMadeService.createBillPayment(
+      createPaymentMadeDTO,
+      trx,
+    );
+    // Link the create bill payment with matched transaction.
+    await super.createMatchedTransaction(
+      uncategorizedTransactionIds,
+      {
+        referenceType: 'BillPayment',
+        referenceId: billPayment.id,
+      },
+      trx,
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionsByCashflow.ts

@@ -0,0 +1,77 @@
+import { GetMatchedTransactionsByType } from './GetMatchedTransactionsByType';
+import { GetMatchedTransactionCashflowTransformer } from './GetMatchedTransactionCashflowTransformer';
+import { GetMatchedTransactionsFilter } from '../types';
+import { BankTransaction } from '@/modules/BankingTransactions/models/BankTransaction';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+import { Inject, Injectable } from '@nestjs/common';
+
+@Injectable()
+export class GetMatchedTransactionsByCashflow extends GetMatchedTransactionsByType {
+  constructor(
+    private readonly transformer: TransformerInjectable,
+
+    @Inject(BankTransaction.name)
+    private readonly bankTransactionModel: typeof BankTransaction,
+  ) {
+    super();
+  }
+
+  /**
+   * Retrieve the matched transactions of cash flow.
+   * @param {number} tenantId
+   * @param {GetMatchedTransactionsFilter} filter
+   * @returns
+   */
+  async getMatchedTransactions(
+    filter: Omit<GetMatchedTransactionsFilter, 'transactionType'>,
+  ) {
+    const transactions = await this.bankTransactionModel
+      .query()
+      .onBuild((q) => {
+        // Not matched to bank transaction.
+        q.withGraphJoined('matchedBankTransaction');
+        q.whereNull('matchedBankTransaction.id');
+
+        // Not categorized.
+        q.modify('notCategorized');
+
+        // Published.
+        q.modify('published');
+
+        if (filter.fromDate) {
+          q.where('date', '>=', filter.fromDate);
+        }
+        if (filter.toDate) {
+          q.where('date', '<=', filter.toDate);
+        }
+        q.orderBy('date', 'DESC');
+      });
+
+    return this.transformer.transform(
+      transactions,
+      new GetMatchedTransactionCashflowTransformer(),
+    );
+  }
+
+  /**
+   * Retrieves the matched transaction of cash flow.
+   * @param {number} tenantId
+   * @param {number} transactionId
+   * @returns
+   */
+  async getMatchedTransaction(transactionId: number) {
+    const transactions = await this.bankTransactionModel
+      .query()
+      .findById(transactionId)
+      .withGraphJoined('matchedBankTransaction')
+      .whereNull('matchedBankTransaction.id')
+      .modify('notCategorized')
+      .modify('published')
+      .throwIfNotFound();
+
+    return this.transformer.transform(
+      transactions,
+      new GetMatchedTransactionCashflowTransformer(),
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionsByExpenses.ts

@@ -0,0 +1,74 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { GetMatchedTransactionsFilter, MatchedTransactionPOJO } from '../types';
+import { GetMatchedTransactionsByType } from './GetMatchedTransactionsByType';
+import { GetMatchedTransactionExpensesTransformer } from './GetMatchedTransactionExpensesTransformer';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+import { Expense } from '@/modules/Expenses/models/Expense.model';
+
+@Injectable()
+export class GetMatchedTransactionsByExpenses extends GetMatchedTransactionsByType {
+  constructor(
+    protected readonly transformer: TransformerInjectable,
+
+    @Inject(Expense.name)
+    protected readonly expenseModel: typeof Expense,
+  ) {
+    super();
+  }
+
+  /**
+   * Retrieves the matched transactions of expenses.
+   * @param {number} tenantId
+   * @param {GetMatchedTransactionsFilter} filter
+   * @returns
+   */
+  async getMatchedTransactions(filter: GetMatchedTransactionsFilter) {
+    // Retrieve the expense matches.
+    const expenses = await this.expenseModel.query().onBuild((query) => {
+      // Filter out the not matched to bank transactions.
+      query.withGraphJoined('matchedBankTransaction');
+      query.whereNull('matchedBankTransaction.id');
+
+      // Filter the published onyl
+      query.modify('filterByPublished');
+
+      if (filter.fromDate) {
+        query.where('paymentDate', '>=', filter.fromDate);
+      }
+      if (filter.toDate) {
+        query.where('paymentDate', '<=', filter.toDate);
+      }
+      if (filter.minAmount) {
+        query.where('totalAmount', '>=', filter.minAmount);
+      }
+      if (filter.maxAmount) {
+        query.where('totalAmount', '<=', filter.maxAmount);
+      }
+      query.orderBy('paymentDate', 'DESC');
+    });
+    return this.transformer.transform(
+      expenses,
+      new GetMatchedTransactionExpensesTransformer(),
+    );
+  }
+
+  /**
+   * Retrieves the given matched expense transaction.
+   * @param {number} tenantId
+   * @param {number} transactionId
+   * @returns {GetMatchedTransactionExpensesTransformer-}
+   */
+  public async getMatchedTransaction(
+    transactionId: number,
+  ): Promise<MatchedTransactionPOJO> {
+    const expense = await this.expenseModel
+      .query()
+      .findById(transactionId)
+      .throwIfNotFound();
+
+    return this.transformer.transform(
+      expense,
+      new GetMatchedTransactionExpensesTransformer(),
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionsByInvoices.service.ts

@@ -0,0 +1,132 @@
+import { Knex } from 'knex';
+import { first } from 'lodash';
+import { GetMatchedTransactionInvoicesTransformer } from './GetMatchedTransactionInvoicesTransformer';
+import {
+  GetMatchedTransactionsFilter,
+  IMatchTransactionDTO,
+  MatchedTransactionPOJO,
+  MatchedTransactionsPOJO,
+} from '../types';
+import { GetMatchedTransactionsByType } from './GetMatchedTransactionsByType';
+import { CreatePaymentReceivedService } from '@/modules/PaymentReceived/commands/CreatePaymentReceived.serivce';
+import { Inject, Injectable } from '@nestjs/common';
+import { SaleInvoice } from '@/modules/SaleInvoices/models/SaleInvoice';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { IPaymentReceivedCreateDTO } from '@/modules/PaymentReceived/types/PaymentReceived.types';
+
+@Injectable()
+export class GetMatchedTransactionsByInvoices extends GetMatchedTransactionsByType {
+  constructor(
+    private readonly transformer: TransformerInjectable,
+    private readonly createPaymentReceivedService: CreatePaymentReceivedService,
+
+    @Inject(SaleInvoice.name)
+    private readonly saleInvoiceModel: typeof SaleInvoice,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {
+    super();
+  }
+
+  /**
+   * Retrieves the matched transactions.
+   * @param {GetMatchedTransactionsFilter} filter -
+   * @returns {Promise<MatchedTransactionsPOJO>}
+   */
+  public async getMatchedTransactions(
+    filter: GetMatchedTransactionsFilter
+  ): Promise<MatchedTransactionsPOJO> {
+    // Retrieve the invoices that not matched, unpaid.
+    const invoices = await this.saleInvoiceModel.query().onBuild((q) => {
+      q.withGraphJoined('matchedBankTransaction');
+      q.whereNull('matchedBankTransaction.id');
+      q.modify('unpaid');
+      q.modify('published');
+
+      if (filter.fromDate) {
+        q.where('invoiceDate', '>=', filter.fromDate);
+      }
+      if (filter.toDate) {
+        q.where('invoiceDate', '<=', filter.toDate);
+      }
+      q.orderBy('invoiceDate', 'DESC');
+    });
+
+    return this.transformer.transform(
+      invoices,
+      new GetMatchedTransactionInvoicesTransformer()
+    );
+  }
+
+  /**
+   * Retrieves the matched transaction.
+   * @param {number} tenantId
+   * @param {number} transactionId
+   * @returns {Promise<MatchedTransactionPOJO>}
+   */
+  public async getMatchedTransaction(
+    transactionId: number
+  ): Promise<MatchedTransactionPOJO> {
+    const invoice = await this.saleInvoiceModel.query().findById(transactionId);
+
+    return this.transformer.transform(
+      invoice,
+      new GetMatchedTransactionInvoicesTransformer()
+    );
+  }
+
+  /**
+   * Creates the common matched transaction.
+   * @param {number} tenantId
+   * @param {Array<number>} uncategorizedTransactionIds
+   * @param {IMatchTransactionDTO} matchTransactionDTO
+   * @param {Knex.Transaction} trx
+   */
+  public async createMatchedTransaction(
+    uncategorizedTransactionIds: Array<number>,
+    matchTransactionDTO: IMatchTransactionDTO,
+    trx?: Knex.Transaction
+  ) {
+    await super.createMatchedTransaction(
+      uncategorizedTransactionIds,
+      matchTransactionDTO,
+      trx
+    );
+    const uncategorizedTransactionId = first(uncategorizedTransactionIds);
+    const uncategorizedTransaction =
+      await this.uncategorizedBankTransactionModel.query(trx)
+        .findById(uncategorizedTransactionId)
+        .throwIfNotFound();
+
+    const invoice = await SaleInvoice.query(trx)
+      .findById(matchTransactionDTO.referenceId)
+      .throwIfNotFound();
+
+    const createPaymentReceivedDTO: IPaymentReceivedCreateDTO = {
+      customerId: invoice.customerId,
+      paymentDate: uncategorizedTransaction.date,
+      amount: invoice.dueAmount,
+      depositAccountId: uncategorizedTransaction.accountId,
+      entries: [
+        {
+          index: 1,
+          invoiceId: invoice.id,
+          paymentAmount: invoice.dueAmount,
+        },
+      ],
+      branchId: invoice.branchId,
+    };
+    // Create a payment received associated to the matched invoice.
+    const paymentReceived = await this.createPaymentReceivedService.createPaymentReceived(
+      createPaymentReceivedDTO,
+      trx
+    );
+    // Link the create payment received with matched invoice transaction.
+    await super.createMatchedTransaction(uncategorizedTransactionIds, {
+      referenceType: 'PaymentReceive',
+      referenceId: paymentReceived.id,
+    }, trx)
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionsByManualJournals.service.ts

@@ -0,0 +1,75 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { GetMatchedTransactionManualJournalsTransformer } from './GetMatchedTransactionManualJournalsTransformer';
+import { GetMatchedTransactionsByType } from './GetMatchedTransactionsByType';
+import { GetMatchedTransactionsFilter } from '../types';
+import { ManualJournal } from '@/modules/ManualJournals/models/ManualJournal';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+
+@Injectable()
+export class GetMatchedTransactionsByManualJournals extends GetMatchedTransactionsByType {
+  constructor(
+    private readonly transformer: TransformerInjectable,
+
+    @Inject(ManualJournal.name)
+    private readonly manualJournalModel: typeof ManualJournal,
+  ) {
+    super();
+  }
+
+  /**
+   * Retrieve the matched transactions of manual journals.
+   * @param {number} tenantId
+   * @param {GetMatchedTransactionsFilter} filter
+   * @returns
+   */
+  async getMatchedTransactions(
+    filter: Omit<GetMatchedTransactionsFilter, 'transactionType'>,
+  ) {
+    // @todo: get the account id from the filter
+    const accountId = 1000;
+
+    const manualJournals = await this.manualJournalModel.query().onBuild((query) => {
+      query.withGraphJoined('matchedBankTransaction');
+      query.whereNull('matchedBankTransaction.id');
+
+      query.withGraphJoined('entries');
+      query.where('entries.accountId', accountId);
+      query.modify('filterByPublished');
+
+      if (filter.fromDate) {
+        query.where('date', '>=', filter.fromDate);
+      }
+      if (filter.toDate) {
+        query.where('date', '<=', filter.toDate);
+      }
+      if (filter.minAmount) {
+        query.where('amount', '>=', filter.minAmount);
+      }
+      if (filter.maxAmount) {
+        query.where('amount', '<=', filter.maxAmount);
+      }
+    });
+    return this.transformer.transform(
+      manualJournals,
+      new GetMatchedTransactionManualJournalsTransformer(),
+    );
+  }
+
+  /**
+   * Retrieves the matched transaction of manual journals.
+   * @param {number} tenantId
+   * @param {number} transactionId
+   * @returns
+   */
+  public async getMatchedTransaction(transactionId: number) {
+    const manualJournal = await this.manualJournalModel.query()
+      .findById(transactionId)
+      .whereNotExists(ManualJournal.relatedQuery('matchedBankTransaction'))
+      .throwIfNotFound();
+
+    return this.transformer.transform(
+      manualJournal,
+      new GetMatchedTransactionManualJournalsTransformer(),
+    );
+  }
+}

packages/server-nest/src/modules/BankingMatching/queries/GetMatchedTransactionsByType.ts

@@ -0,0 +1,66 @@
+import { Knex } from 'knex';
+import {
+  GetMatchedTransactionsFilter,
+  IMatchTransactionDTO,
+  MatchedTransactionPOJO,
+  MatchedTransactionsPOJO,
+} from '../types';
+import PromisePool from '@supercharge/promise-pool';
+import { MatchedBankTransaction } from '../models/MatchedBankTransaction';
+import { Inject } from '@nestjs/common';
+
+export abstract class GetMatchedTransactionsByType {
+  @Inject(MatchedBankTransaction.name)
+  private readonly matchedBankTransactionModel: typeof MatchedBankTransaction;
+
+  /**
+   * Retrieves the matched transactions.
+   * @param {number} tenantId -
+   * @param {GetMatchedTransactionsFilter} filter -
+   * @returns {Promise<MatchedTransactionsPOJO>}
+   */
+  public async getMatchedTransactions(
+    filter: GetMatchedTransactionsFilter
+  ): Promise<MatchedTransactionsPOJO> {
+    throw new Error(
+      'The `getMatchedTransactions` method is not defined for the transaction type.'
+    );
+  }
+
+  /**
+   * Retrieves the matched transaction details.
+   * @param {number} tenantId -
+   * @param {number} transactionId -
+   * @returns {Promise<MatchedTransactionPOJO>}
+   */
+  public async getMatchedTransaction(
+    transactionId: number
+  ): Promise<MatchedTransactionPOJO> {
+    throw new Error(
+      'The `getMatchedTransaction` method is not defined for the transaction type.'
+    );
+  }
+
+  /**
+   * Creates the common matched transaction.
+   * @param {number} tenantId
+   * @param {Array<number>} uncategorizedTransactionIds
+   * @param {IMatchTransactionDTO} matchTransactionDTO
+   * @param {Knex.Transaction} trx
+   */
+  public async createMatchedTransaction(
+    uncategorizedTransactionIds: Array<number>,
+    matchTransactionDTO: IMatchTransactionDTO,
+    trx?: Knex.Transaction
+  ) {
+    await PromisePool.withConcurrency(2)
+      .for(uncategorizedTransactionIds)
+      .process(async (uncategorizedTransactionId) => {
+        await this.matchedBankTransactionModel.query(trx).insert({
+          uncategorizedTransactionId,
+          referenceType: matchTransactionDTO.referenceType,
+          referenceId: matchTransactionDTO.referenceId,
+        });
+      });
+  }
+}

packages/server-nest/src/modules/BankingMatching/types.ts

@@ -0,0 +1,73 @@
+import { Knex } from 'knex';
+
+export interface IBankTransactionMatchingEventPayload {
+  tenantId: number;
+  uncategorizedTransactionIds: Array<number>;
+  matchedTransactions: Array<IMatchTransactionDTO>;
+  trx?: Knex.Transaction;
+}
+
+export interface IBankTransactionMatchedEventPayload {
+  // tenantId: number;
+  uncategorizedTransactionIds: Array<number>;
+  matchedTransactions: Array<IMatchTransactionDTO>;
+  trx?: Knex.Transaction;
+}
+
+export interface IBankTransactionUnmatchingEventPayload {
+  // tenantId: number;
+  uncategorizedTransactionId: number;
+  trx?: Knex.Transaction;
+}
+
+export interface IBankTransactionUnmatchedEventPayload {
+  // tenantId: number;
+  uncategorizedTransactionId: number;
+  trx?: Knex.Transaction;
+}
+
+export interface IMatchTransactionDTO {
+  referenceType: string;
+  referenceId: number;
+}
+
+export interface IMatchTransactionsDTO {
+  uncategorizedTransactionIds: Array<number>;
+  matchedTransactions: Array<IMatchTransactionDTO>;
+}
+
+export interface GetMatchedTransactionsFilter {
+  fromDate: string;
+  toDate: string;
+  minAmount: number;
+  maxAmount: number;
+  transactionType: string;
+}
+
+export interface MatchedTransactionPOJO {
+  amount: number;
+  amountFormatted: string;
+  date: string;
+  dateFormatted: string;
+  referenceNo: string;
+  transactionNo: string;
+  transactionId: number;
+  transactionType: string;
+}
+
+export type MatchedTransactionsPOJO = {
+  perfectMatches: Array<MatchedTransactionPOJO>;
+  possibleMatches: Array<MatchedTransactionPOJO>;
+  totalPending: number;
+};
+
+export const ERRORS = {
+  RESOURCE_TYPE_MATCHING_TRANSACTION_INVALID:
+    'RESOURCE_TYPE_MATCHING_TRANSACTION_INVALID',
+  RESOURCE_ID_MATCHING_TRANSACTION_INVALID:
+    'RESOURCE_ID_MATCHING_TRANSACTION_INVALID',
+  TOTAL_MATCHING_TRANSACTIONS_INVALID: 'TOTAL_MATCHING_TRANSACTIONS_INVALID',
+  TRANSACTION_ALREADY_MATCHED: 'TRANSACTION_ALREADY_MATCHED',
+  CANNOT_MATCH_EXCLUDED_TRANSACTION: 'CANNOT_MATCH_EXCLUDED_TRANSACTION',
+  CANNOT_DELETE_TRANSACTION_MATCHED: 'CANNOT_DELETE_TRANSACTION_MATCHED',
+};

packages/server-nest/src/modules/BankingPlaid/BankingPlaid.module.ts

@@ -0,0 +1,20 @@
+import { Module } from "@nestjs/common";
+import { PlaidUpdateTransactionsOnItemCreatedSubscriber } from "./subscribers/PlaidUpdateTransactionsOnItemCreatedSubscriber";
+import { PlaidUpdateTransactions } from "./command/PlaidUpdateTransactions";
+import { PlaidSyncDb } from "./command/PlaidSyncDB";
+import { PlaidWebooks } from "./command/PlaidWebhooks";
+import { PlaidLinkTokenService } from "./queries/GetPlaidLinkToken.service";
+import { PlaidApplication } from "./PlaidApplication";
+
+
+@Module({
+  providers: [
+    PlaidUpdateTransactions,
+    PlaidSyncDb,
+    PlaidWebooks,
+    PlaidLinkTokenService,
+    PlaidApplication,
+    PlaidUpdateTransactionsOnItemCreatedSubscriber,
+  ],
+})
+export class BankingPlaidModule {}

packages/server-nest/src/modules/BankingPlaid/PlaidApplication.ts

@@ -0,0 +1,50 @@
+import { PlaidLinkTokenService } from './queries/GetPlaidLinkToken.service';
+import { PlaidItemService } from './command/PlaidItem';
+import { PlaidWebooks } from './command/PlaidWebhooks';
+import { Injectable } from '@nestjs/common';
+import { PlaidItemDTO } from './types/BankingPlaid.types';
+
+@Injectable()
+export class PlaidApplication {
+  constructor(
+    private readonly getLinkTokenService: PlaidLinkTokenService,
+    private readonly plaidItemService: PlaidItemService,
+    private readonly plaidWebhooks: PlaidWebooks,
+  ) {}
+
+  /**
+   * Retrieves the Plaid link token.
+   * @returns {Promise<string>}
+   */
+  public getLinkToken() {
+    return this.getLinkTokenService.getLinkToken();
+  }
+
+  /**
+   * Exchanges the Plaid access token.
+   * @param {PlaidItemDTO} itemDTO
+   * @returns
+   */
+  public exchangeToken(itemDTO: PlaidItemDTO): Promise<void> {
+    return this.plaidItemService.item(itemDTO);
+  }
+
+  /**
+   * Listens to Plaid webhooks
+   * @param {string} plaidItemId - Plaid item id.
+   * @param {string} webhookType - Webhook type.
+   * @param {string} webhookCode - Webhook code.
+   * @returns {Promise<void>}
+   */
+  public webhooks(
+    plaidItemId: string,
+    webhookType: string,
+    webhookCode: string,
+  ): Promise<void> {
+    return this.plaidWebhooks.webhooks(
+      plaidItemId,
+      webhookType,
+      webhookCode,
+    );
+  }
+}

packages/server-nest/src/modules/BankingPlaid/PlaidFetchTransactionsJob.ts

@@ -0,0 +1,43 @@
+// import Container, { Service } from 'typedi';
+// import { PlaidUpdateTransactions } from './PlaidUpdateTransactions';
+// import { IPlaidItemCreatedEventPayload } from '@/interfaces';
+
+// @Service()
+// export class PlaidFetchTransactionsJob {
+//   /**
+//    * Constructor method.
+//    */
+//   constructor(agenda) {
+//     agenda.define(
+//       'plaid-update-account-transactions',
+//       { priority: 'high', concurrency: 2 },
+//       this.handler
+//     );
+//   }
+
+//   /**
+//    * Triggers the function.
+//    */
+//   private handler = async (job, done: Function) => {
+//     const { tenantId, plaidItemId } = job.attrs
+//       .data as IPlaidItemCreatedEventPayload;
+
+//     const plaidFetchTransactionsService = Container.get(
+//       PlaidUpdateTransactions
+//     );
+//     const io = Container.get('socket');
+
+//     try {
+//       await plaidFetchTransactionsService.updateTransactions(
+//         tenantId,
+//         plaidItemId
+//       );
+//       // Notify the frontend to reflect the new transactions changes.
+//       io.emit('NEW_TRANSACTIONS_DATA', { plaidItemId });
+//       done();
+//     } catch (error) {
+//       console.log(error);
+//       done(error);
+//     }
+//   };
+// }

packages/server-nest/src/modules/BankingPlaid/PlaidWebhookTenantBootMiddleware.ts

@@ -0,0 +1,32 @@
+// import { Request, Response, NextFunction } from 'express';
+// import { SystemPlaidItem, Tenant } from '@/system/models';
+// import tenantDependencyInjection from '@/api/middleware/TenantDependencyInjection';
+
+// export const PlaidWebhookTenantBootMiddleware = async (
+//   req: Request,
+//   res: Response,
+//   next: NextFunction
+// ) => {
+//   const { item_id: plaidItemId } = req.body;
+//   const plaidItem = await SystemPlaidItem.query().findOne({ plaidItemId });
+
+//   const notFoundOrganization = () => {
+//     return res.boom.unauthorized('Organization identication not found.', {
+//       errors: [{ type: 'ORGANIZATION.ID.NOT.FOUND', code: 100 }],
+//     });
+//   };
+//   // In case the given organization not found.
+//   if (!plaidItem) {
+//     return notFoundOrganization();
+//   }
+//   const tenant = await Tenant.query()
+//     .findById(plaidItem.tenantId)
+//     .withGraphFetched('metadata');
+
+//   // When the given organization id not found on the system storage.
+//   if (!tenant) {
+//     return notFoundOrganization();
+//   }
+//   tenantDependencyInjection(req, tenant);
+//   next();
+// };

packages/server-nest/src/modules/BankingPlaid/command/PlaidItem.ts

@@ -0,0 +1,63 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { PlaidItem } from '../models/PlaidItem';
+import { PlaidApi } from 'plaid';
+import { PLAID_CLIENT } from '../../Plaid/Plaid.module';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { events } from '@/common/events/events';
+import { SystemPlaidItem } from '../models/SystemPlaidItem';
+import { TenancyContext } from '@/modules/Tenancy/TenancyContext.service';
+import { PlaidItemDTO } from '../types/BankingPlaid.types';
+
+@Injectable()
+export class PlaidItemService {
+  constructor(
+    private readonly eventEmitter: EventEmitter2,
+    private readonly tenancyContext: TenancyContext,
+
+    @Inject(SystemPlaidItem.name)
+    private readonly systemPlaidItemModel: typeof SystemPlaidItem,
+
+    @Inject(PlaidItem.name)
+    private readonly plaidItemModel: typeof PlaidItem,
+
+    @Inject(PLAID_CLIENT)
+    private readonly plaidClient: PlaidApi,
+  ) {}
+
+  /**
+   * Exchanges the public token to get access token and item id and then creates
+   * a new Plaid item.
+   * @param {PlaidItemDTO} itemDTO - Plaid item data transfer object.
+   * @returns {Promise<void>}
+   */
+  public async item(itemDTO: PlaidItemDTO): Promise<void> {
+    const { publicToken, institutionId } = itemDTO;
+
+    const tenant = await this.tenancyContext.getTenant();
+    const tenantId = tenant.id;
+
+    // Exchange the public token for a private access token and store with the item.
+    const response = await this.plaidClient.itemPublicTokenExchange({
+      public_token: publicToken,
+    });
+    const plaidAccessToken = response.data.access_token;
+    const plaidItemId = response.data.item_id;
+
+    // Store the Plaid item metadata on tenant scope.
+    const plaidItem = await this.plaidItemModel.query().insertAndFetch({
+      tenantId,
+      plaidAccessToken,
+      plaidItemId,
+      plaidInstitutionId: institutionId,
+    });
+    // Stores the Plaid item id on system scope.
+    await this.systemPlaidItemModel.query().insert({ tenantId, plaidItemId });
+
+    // Triggers `onPlaidItemCreated` event.
+    await this.eventEmitter.emitAsync(events.plaid.onItemCreated, {
+      plaidAccessToken,
+      plaidItemId,
+      plaidInstitutionId: institutionId,
+    } as IPlaidItemCreatedEventPayload);
+  }
+}

packages/server-nest/src/modules/BankingPlaid/command/PlaidSyncDB.ts

@@ -0,0 +1,245 @@
+import * as R from 'ramda';
+import bluebird from 'bluebird';
+import { entries, groupBy } from 'lodash';
+import {
+  AccountBase as PlaidAccountBase,
+  Item as PlaidItem,
+  Institution as PlaidInstitution,
+  Transaction as PlaidTransaction,
+} from 'plaid';
+import {
+  transformPlaidAccountToCreateAccount,
+  transformPlaidTrxsToCashflowCreate,
+} from '../utils';
+import { Knex } from 'knex';
+import uniqid from 'uniqid';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { RemovePendingUncategorizedTransaction } from '../../BankingTransactions/commands/RemovePendingUncategorizedTransaction.service';
+import { CreateAccountService } from '../../Accounts/CreateAccount.service';
+import { Account } from '../../Accounts/models/Account.model';
+import { events } from '@/common/events/events';
+import { PlaidItem as PlaidItemModel } from '../models/PlaidItem';
+import { IAccountCreateDTO } from '@/interfaces/Account';
+import { IPlaidTransactionsSyncedEventPayload } from '../types/BankingPlaid.types';
+import { UncategorizedBankTransaction } from '../../BankingTransactions/models/UncategorizedBankTransaction';
+import { Inject, Injectable } from '@nestjs/common';
+import { CreateUncategorizedTransactionService } from '@/modules/BankingCategorize/commands/CreateUncategorizedTransaction.service';
+
+const CONCURRENCY_ASYNC = 10;
+
+@Injectable()
+export class PlaidSyncDb {
+  constructor(
+    private readonly createAccountService: CreateAccountService,
+    private readonly createUncategorizedTransaction: CreateUncategorizedTransactionService,
+    private readonly removePendingTransaction: RemovePendingUncategorizedTransaction,
+    private readonly eventPublisher: EventEmitter2,
+
+    @Inject(Account.name)
+    private readonly accountModel: typeof Account,
+
+    @Inject(PlaidItemModel.name)
+    private readonly plaidItemModel: typeof PlaidItemModel,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Syncs the Plaid bank account.
+   * @param {number} tenantId
+   * @param {IAccountCreateDTO} createBankAccountDTO
+   * @param {Knex.Transaction} trx
+   * @returns {Promise<void>}
+   */
+  public async syncBankAccount(
+    createBankAccountDTO: IAccountCreateDTO,
+    trx?: Knex.Transaction,
+  ) {
+    const plaidAccount = await this.accountModel
+      .query(trx)
+      .findOne('plaidAccountId', createBankAccountDTO.plaidAccountId);
+    // Can't continue if the Plaid account is already created.
+    if (plaidAccount) {
+      return;
+    }
+    await this.createAccountService.createAccount(createBankAccountDTO, trx, {
+      ignoreUniqueName: true,
+    });
+  }
+
+  /**
+   * Syncs the plaid accounts to the system accounts.
+   * @param {number} tenantId Tenant ID.
+   * @param {PlaidAccount[]} plaidAccounts
+   * @returns {Promise<void>}
+   */
+  public async syncBankAccounts(
+    plaidAccounts: PlaidAccountBase[],
+    institution: PlaidInstitution,
+    item: PlaidItem,
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    const transformToPlaidAccounts = transformPlaidAccountToCreateAccount(
+      item,
+      institution,
+    );
+    const accountCreateDTOs = R.map(transformToPlaidAccounts)(plaidAccounts);
+
+    await bluebird.map(
+      accountCreateDTOs,
+      (createAccountDTO: any) => this.syncBankAccount(createAccountDTO, trx),
+      { concurrency: CONCURRENCY_ASYNC },
+    );
+  }
+
+  /**
+   * Synsc the Plaid transactions to the system GL entries.
+   * @param {number} tenantId - Tenant ID.
+   * @param {number} plaidAccountId - Plaid account ID.
+   * @param {PlaidTransaction[]} plaidTranasctions - Plaid transactions
+   * @return {Promise<void>}
+   */
+  public async syncAccountTranactions(
+    plaidAccountId: number,
+    plaidTranasctions: PlaidTransaction[],
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    const batch = uniqid();
+    const cashflowAccount = await this.accountModel
+      .query(trx)
+      .findOne({ plaidAccountId })
+      .throwIfNotFound();
+
+    // Transformes the Plaid transactions to cashflow create DTOs.
+    const transformTransaction = transformPlaidTrxsToCashflowCreate(
+      cashflowAccount.id,
+    );
+    const uncategorizedTransDTOs =
+      R.map(transformTransaction)(plaidTranasctions);
+
+    // Creating account transaction queue.
+    await bluebird.map(
+      uncategorizedTransDTOs,
+      (uncategoriedDTO) =>
+        this.createUncategorizedTransaction.create(
+          { ...uncategoriedDTO, batch },
+          trx,
+        ),
+      { concurrency: 1 },
+    );
+    // Triggers `onPlaidTransactionsSynced` event.
+    await this.eventPublisher.emitAsync(events.plaid.onTransactionsSynced, {
+      plaidAccountId,
+      batch,
+    } as IPlaidTransactionsSyncedEventPayload);
+  }
+
+  /**
+   * Syncs the accounts transactions in paraller under controlled concurrency.
+   * @param {number} tenantId
+   * @param {PlaidTransaction[]} plaidTransactions
+   * @return {Promise<void>}
+   */
+  public async syncAccountsTransactions(
+    plaidAccountsTransactions: PlaidTransaction[],
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    const groupedTrnsxByAccountId = entries(
+      groupBy(plaidAccountsTransactions, 'account_id'),
+    );
+    await bluebird.map(
+      groupedTrnsxByAccountId,
+      ([plaidAccountId, plaidTransactions]: [number, PlaidTransaction[]]) => {
+        return this.syncAccountTranactions(
+          plaidAccountId,
+          plaidTransactions,
+          trx,
+        );
+      },
+      { concurrency: CONCURRENCY_ASYNC },
+    );
+  }
+
+  /**
+   * Syncs the removed Plaid transactions ids from the cashflow system transactions.
+   * @param {string[]} plaidTransactionsIds - Plaid Transactions IDs.
+   */
+  public async syncRemoveTransactions(
+    plaidTransactionsIds: string[],
+    trx?: Knex.Transaction,
+  ) {
+    const uncategorizedTransactions =
+      await this.uncategorizedBankTransactionModel
+        .query(trx)
+        .whereIn('plaidTransactionId', plaidTransactionsIds);
+    const uncategorizedTransactionsIds = uncategorizedTransactions.map(
+      (trans) => trans.id,
+    );
+    await bluebird.map(
+      uncategorizedTransactionsIds,
+      (uncategorizedTransactionId: number) =>
+        this.removePendingTransaction.removePendingTransaction(
+          uncategorizedTransactionId,
+          trx,
+        ),
+      { concurrency: CONCURRENCY_ASYNC },
+    );
+  }
+
+  /**
+   * Syncs the Plaid item last transaction cursor.
+   * @param {number} tenantId - Tenant ID.
+   * @param {string} itemId - Plaid item ID.
+   * @param {string} lastCursor - Last transaction cursor.
+   * @return {Promise<void>}
+   */
+  public async syncTransactionsCursor(
+    plaidItemId: string,
+    lastCursor: string,
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    await this.plaidItemModel
+      .query(trx)
+      .findOne({ plaidItemId })
+      .patch({ lastCursor });
+  }
+
+  /**
+   * Updates the last feeds updated at of the given Plaid accounts ids.
+   * @param {number} tenantId
+   * @param {string[]} plaidAccountIds
+   * @return {Promise<void>}
+   */
+  public async updateLastFeedsUpdatedAt(
+    plaidAccountIds: string[],
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    await this.accountModel
+      .query(trx)
+      .whereIn('plaid_account_id', plaidAccountIds)
+      .patch({
+        lastFeedsUpdatedAt: new Date(),
+      });
+  }
+
+  /**
+   * Updates the accounts feed active status of the given Plaid accounts ids.
+   * @param {number} tenantId
+   * @param {number[]} plaidAccountIds
+   * @param {boolean} isFeedsActive
+   * @returns {Promise<void>}
+   */
+  public async updateAccountsFeedsActive(
+    plaidAccountIds: string[],
+    isFeedsActive: boolean = true,
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    await this.accountModel
+      .query(trx)
+      .whereIn('plaid_account_id', plaidAccountIds)
+      .patch({
+        isFeedsActive,
+      });
+  }
+}

packages/server-nest/src/modules/BankingPlaid/command/PlaidUpdateTransactions.ts

@@ -0,0 +1,148 @@
+import { Knex } from 'knex';
+import { PlaidSyncDb } from './PlaidSyncDB';
+import { PlaidFetchedTransactionsUpdates } from '../types/BankingPlaid.types';
+import { PlaidItem } from '../models/PlaidItem';
+import { Inject, Injectable } from '@nestjs/common';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import {
+  CountryCode,
+  PlaidApi,
+  Transaction as PlaidTransaction,
+  RemovedTransaction,
+} from 'plaid';
+import { PLAID_CLIENT } from '@/modules/Plaid/Plaid.module';
+
+@Injectable()
+export class PlaidUpdateTransactions {
+  constructor(
+    private readonly plaidItemModel: typeof PlaidItem,
+    private readonly plaidSync: PlaidSyncDb,
+    private readonly uow: UnitOfWork,
+
+    @Inject(PLAID_CLIENT)
+    private readonly plaidClient: PlaidApi,
+  ) {}
+
+  /**
+   * Handles sync the Plaid item to Bigcaptial under UOW.
+   * @param {number} tenantId - Tenant id.
+   * @param {number} plaidItemId - Plaid item id.
+   * @returns {Promise<{ addedCount: number; modifiedCount: number; removedCount: number; }>}
+   */
+  public async updateTransactions(plaidItemId: string) {
+    return this.uow.withTransaction((trx: Knex.Transaction) => {
+      return this.updateTransactionsWork(plaidItemId, trx);
+    });
+  }
+
+  /**
+   * Handles the fetching and storing the following:
+   *  - New, modified, or removed transactions.
+   *  - New bank accounts.
+   *  - Last accounts feeds updated at.
+   *  - Turn on the accounts feed flag.
+   * @param {number} tenantId - Tenant ID.
+   * @param {string} plaidItemId - The Plaid ID for the item.
+   * @returns {Promise<{  addedCount: number; modifiedCount: number; removedCount: number; }>}
+   */
+  public async updateTransactionsWork(
+    plaidItemId: string,
+    trx?: Knex.Transaction,
+  ): Promise<{
+    addedCount: number;
+    modifiedCount: number;
+    removedCount: number;
+  }> {
+    // Fetch new transactions from plaid api.
+    const { added, modified, removed, cursor, accessToken } =
+      await this.fetchTransactionUpdates(plaidItemId);
+
+    const request = { access_token: accessToken };
+    const {
+      data: { accounts, item },
+    } = await this.plaidClient.accountsGet(request);
+
+    const plaidAccountsIds = accounts.map((a) => a.account_id);
+    const {
+      data: { institution },
+    } = await this.plaidClient.institutionsGetById({
+      institution_id: item.institution_id,
+      country_codes: [CountryCode.Us, CountryCode.Gb],
+    });
+    // Sync bank accounts.
+    await this.plaidSync.syncBankAccounts(accounts, institution, item, trx);
+    // Sync removed transactions.
+    await this.plaidSync.syncRemoveTransactions(
+      removed?.map((r) => r.transaction_id),
+      trx,
+    );
+    // Sync bank account transactions.
+    await this.plaidSync.syncAccountsTransactions(added.concat(modified), trx);
+    // Sync transactions cursor.
+    await this.plaidSync.syncTransactionsCursor(plaidItemId, cursor, trx);
+    // Update the last feeds updated at of the updated accounts.
+    await this.plaidSync.updateLastFeedsUpdatedAt(plaidAccountsIds, trx);
+    // Turn on the accounts feeds flag.
+    await this.plaidSync.updateAccountsFeedsActive(plaidAccountsIds, true, trx);
+
+    return {
+      addedCount: added.length,
+      modifiedCount: modified.length,
+      removedCount: removed.length,
+    };
+  }
+
+  /**
+   * Fetches transactions from the `Plaid API` for a given item.
+   * @param {number} tenantId - Tenant ID.
+   * @param {string} plaidItemId - The Plaid ID for the item.
+   * @returns {Promise<PlaidFetchedTransactionsUpdates>}
+   */
+  private async fetchTransactionUpdates(
+    plaidItemId: string,
+  ): Promise<PlaidFetchedTransactionsUpdates> {
+    // the transactions endpoint is paginated, so we may need to hit it multiple times to
+    // retrieve all available transactions.
+    const plaidItem = await this.plaidItemModel
+      .query()
+      .findOne('plaidItemId', plaidItemId);
+    if (!plaidItem) {
+      throw new Error('The given Plaid item id is not found.');
+    }
+    const { plaidAccessToken, lastCursor } = plaidItem;
+    let cursor = lastCursor;
+
+    // New transaction updates since "cursor"
+    let added: PlaidTransaction[] = [];
+    let modified: PlaidTransaction[] = [];
+    // Removed transaction ids
+    let removed: RemovedTransaction[] = [];
+    let hasMore = true;
+
+    const batchSize = 100;
+    try {
+      // Iterate through each page of new transaction updates for item
+      /* eslint-disable no-await-in-loop */
+      while (hasMore) {
+        const request = {
+          access_token: plaidAccessToken,
+          cursor: cursor,
+          count: batchSize,
+        };
+        const response = await this.plaidClient.transactionsSync(request);
+        const data = response.data;
+        // Add this page of results
+        added = added.concat(data.added);
+        modified = modified.concat(data.modified);
+        removed = removed.concat(data.removed);
+        hasMore = data.has_more;
+        // Update cursor to the next cursor
+        cursor = data.next_cursor;
+      }
+    } catch (err) {
+      console.error(`Error fetching transactions: ${err.message}`);
+      cursor = lastCursor;
+    }
+    return { added, modified, removed, cursor, accessToken: plaidAccessToken };
+  }
+}

packages/server-nest/src/modules/BankingPlaid/command/PlaidWebhooks.ts

@@ -0,0 +1,152 @@
+import { PlaidItem } from '../models/PlaidItem';
+import { PlaidUpdateTransactions } from './PlaidUpdateTransactions';
+import { Inject, Injectable } from '@nestjs/common';
+
+@Injectable()
+export class PlaidWebooks {
+  constructor(
+    private readonly updateTransactionsService: PlaidUpdateTransactions,
+
+    @Inject(PlaidItem.name)
+    private readonly plaidItemModel: typeof PlaidItem,
+  ) {}
+
+  /**
+   * Listens to Plaid webhooks
+   * @param {string} webhookType - Webhook type.
+   * @param {string} plaidItemId - Plaid item Id.
+   * @param {string} webhookCode - webhook code.
+   */
+  public async webhooks(
+    plaidItemId: string,
+    webhookType: string,
+    webhookCode: string,
+  ): Promise<void> {
+    const _webhookType = webhookType.toLowerCase();
+
+    // There are five types of webhooks: AUTH, TRANSACTIONS, ITEM, INCOME, and ASSETS.
+    // @TODO implement handling for remaining webhook types.
+    const webhookHandlerMap = {
+      transactions: this.handleTransactionsWebooks.bind(this),
+      item: this.itemsHandler.bind(this),
+    };
+    const webhookHandler =
+      webhookHandlerMap[_webhookType] || this.unhandledWebhook;
+
+    await webhookHandler(plaidItemId, webhookCode);
+  }
+
+  /**
+   * Handles all unhandled/not yet implemented webhook events.
+   * @param {string} webhookType - Webhook type.
+   * @param {string} webhookCode - Webhook code.
+   * @param {string} plaidItemId - Plaid item id.
+   */
+  private async unhandledWebhook(
+    webhookType: string,
+    webhookCode: string,
+    plaidItemId: string,
+  ): Promise<void> {
+    console.log(
+      `UNHANDLED ${webhookType} WEBHOOK: ${webhookCode}: Plaid item id ${plaidItemId}: unhandled webhook type received.`,
+    );
+  }
+
+  /**
+   * Logs to console and emits to socket
+   * @param {string} additionalInfo - Additional info.
+   * @param {string} webhookCode - Webhook code.
+   * @param {string} plaidItemId - Plaid item id.
+   */
+  private serverLogAndEmitSocket(
+    additionalInfo: string,
+    webhookCode: string,
+    plaidItemId: string,
+  ): void {
+    console.log(
+      `PLAID WEBHOOK: TRANSACTIONS: ${webhookCode}: Plaid_item_id ${plaidItemId}: ${additionalInfo}`,
+    );
+  }
+
+  /**
+   * Handles all transaction webhook events. The transaction webhook notifies
+   * you that a single item has new transactions available.
+   * @param {string} plaidItemId - Plaid item id.
+   * @param {string} webhookCode - Webhook code.
+   * @returns {Promise<void>}
+   */
+  public async handleTransactionsWebooks(
+    tenantId: number,
+    plaidItemId: string,
+    webhookCode: string,
+  ): Promise<void> {
+    const plaidItem = await this.plaidItemModel
+      .query()
+      .findOne({ plaidItemId })
+      .throwIfNotFound();
+
+    switch (webhookCode) {
+      case 'SYNC_UPDATES_AVAILABLE': {
+        if (plaidItem.isPaused) {
+          this.serverLogAndEmitSocket(
+            'Plaid item syncing is paused.',
+            webhookCode,
+            plaidItemId,
+          );
+          return;
+        }
+        // Fired when new transactions data becomes available.
+        const { addedCount, modifiedCount, removedCount } =
+          await this.updateTransactionsService.updateTransactions(plaidItemId);
+
+        this.serverLogAndEmitSocket(
+          `Transactions: ${addedCount} added, ${modifiedCount} modified, ${removedCount} removed`,
+          webhookCode,
+          plaidItemId,
+        );
+        break;
+      }
+      case 'DEFAULT_UPDATE':
+      case 'INITIAL_UPDATE':
+      case 'HISTORICAL_UPDATE':
+        /* ignore - not needed if using sync endpoint + webhook */
+        break;
+      default:
+        this.serverLogAndEmitSocket(
+          `unhandled webhook type received.`,
+          webhookCode,
+          plaidItemId,
+        );
+    }
+  }
+
+  /**
+   * Handles all Item webhook events.
+   * @param {number} tenantId - Tenant ID
+   * @param {string} webhookCode - The webhook code
+   * @param {string} plaidItemId - The Plaid ID for the item
+   * @returns {Promise<void>}
+   */
+  public async itemsHandler(
+    plaidItemId: string,
+    webhookCode: string,
+  ): Promise<void> {
+    switch (webhookCode) {
+      case 'WEBHOOK_UPDATE_ACKNOWLEDGED':
+        this.serverLogAndEmitSocket('is updated', plaidItemId, error);
+        break;
+      case 'ERROR': {
+        break;
+      }
+      case 'PENDING_EXPIRATION': {
+        break;
+      }
+      default:
+        this.serverLogAndEmitSocket(
+          'unhandled webhook type received.',
+          webhookCode,
+          plaidItemId,
+        );
+    }
+  }
+}

packages/server-nest/src/modules/BankingPlaid/models/PlaidItem.ts

@@ -2,6 +2,11 @@ import { BaseModel } from '@/models/Model';
 
 export class PlaidItem extends BaseModel {
   pausedAt: Date;
+  plaidAccessToken: string;
+  lastCursor?: string;
+  tenantId: number;
+  plaidItemId: string;
+  plaidInstitutionId: string;
 
   /**
    * Table name.

packages/server-nest/src/modules/BankingPlaid/models/SystemPlaidItem.ts

@@ -0,0 +1,49 @@
+import { BaseModel } from '@/models/Model';
+import { Model } from 'objection';
+
+export class SystemPlaidItem extends BaseModel {
+  tenantId: number;
+  plaidItemId: string;
+
+  /**
+   * Table name.
+   */
+  static get tableName() {
+    return 'plaid_items';
+  }
+
+  /**
+   * Timestamps columns.
+   */
+  get timestamps() {
+    return ['createdAt', 'updatedAt'];
+  }
+
+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return [];
+  }
+
+  /**
+   * Relationship mapping.
+   */
+  static get relationMappings() {
+    const Tenant = require('system/models/Tenant');
+
+    return {
+      /**
+       * System user may belongs to tenant model.
+       */
+      tenant: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: Tenant.default,
+        join: {
+          from: 'users.tenantId',
+          to: 'tenants.id',
+        },
+      },
+    };
+  }
+}

packages/server-nest/src/modules/BankingPlaid/queries/GetPlaidLinkToken.service.ts

@@ -0,0 +1,41 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { PLAID_CLIENT } from '@/modules/Plaid/Plaid.module';
+import { CountryCode, PlaidApi, Products } from 'plaid';
+
+@Injectable()
+export class PlaidLinkTokenService {
+  constructor(
+    public readonly configService: ConfigService,
+
+    @Inject(PLAID_CLIENT)
+    private readonly plaidClient: PlaidApi,
+  ) {}
+
+  /**
+   * Retrieves the plaid link token.
+   * @param {number} tenantId
+   * @returns
+   */
+  public async getLinkToken() {
+    const accessToken = null;
+
+    // Must include transactions in order to receive transactions webhooks
+    const linkTokenParams = {
+      user: {
+        // This should correspond to a unique id for the current user.
+        client_user_id: 'uniqueId' + 1,
+      },
+      client_name: 'Pattern',
+      products: [Products.Transactions],
+      country_codes: [CountryCode.Us],
+      language: 'en',
+      webhook: this.configService.get('plaid.linkWebhook'),
+      access_token: accessToken,
+    };
+    const createResponse =
+      await this.plaidClient.linkTokenCreate(linkTokenParams);
+
+    return createResponse.data;
+  }
+}

packages/server-nest/src/modules/BankingPlaid/subscribers/PlaidUpdateTransactionsOnItemCreatedSubscriber.ts

@@ -0,0 +1,22 @@
+import { events } from '@/common/events/events';
+import { Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { IPlaidItemCreatedEventPayload } from '../types/BankingPlaid.types';
+
+@Injectable()
+export class PlaidUpdateTransactionsOnItemCreatedSubscriber {
+  /**
+   * Updates the Plaid item transactions
+   * @param {IPlaidItemCreatedEventPayload} payload - Event payload.
+   */
+  @OnEvent(events.plaid.onItemCreated)
+  public async handleUpdateTransactionsOnItemCreated({
+    tenantId,
+    plaidItemId,
+    plaidAccessToken,
+    plaidInstitutionId,
+  }: IPlaidItemCreatedEventPayload) {
+    const payload = { tenantId, plaidItemId };
+    // await this.agenda.now('plaid-update-account-transactions', payload);
+  };
+}

packages/server-nest/src/modules/BankingPlaid/subscribers/RecognizeSyncedBankTransactions.subscriber.ts

@@ -0,0 +1,30 @@
+import { Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { events } from '@/common/events/events';
+import { RecognizeTranasctionsService } from '@/modules/BankingTranasctionsRegonize/commands/RecognizeTranasctions.service';
+import { runAfterTransaction } from '@/modules/Tenancy/TenancyDB/TransactionsHooks';
+import { IPlaidTransactionsSyncedEventPayload } from '../types/BankingPlaid.types';
+
+@Injectable()
+export class RecognizeSyncedBankTranasctionsSubscriber  {
+  constructor(
+    private readonly recognizeTranasctionsService: RecognizeTranasctionsService,
+  ) {}
+
+  /**
+   * Updates the Plaid item transactions
+   * @param {IPlaidItemCreatedEventPayload} payload - Event payload.
+   */
+  @OnEvent(events.plaid.onTransactionsSynced)
+  public async handleRecognizeSyncedBankTransactions({
+    batch,
+    trx,
+  }: IPlaidTransactionsSyncedEventPayload) {
+    runAfterTransaction(trx, async () => {
+      await this.recognizeTranasctionsService.recognizeTransactions(
+        null,
+        { batch }
+      );
+    });
+  };
+}

packages/server-nest/src/modules/BankingPlaid/types/BankingPlaid.types.ts

@@ -0,0 +1,32 @@
+import { Knex } from "knex";
+import { RemovedTransaction, Transaction } from "plaid";
+
+export interface IPlaidTransactionsSyncedEventPayload {
+  // tenantId: number;
+  plaidAccountId: number;
+  batch: string;
+  trx?: Knex.Transaction
+}
+
+export interface PlaidItemDTO {
+  publicToken: string;
+  institutionId: string;
+}
+
+
+export interface PlaidFetchedTransactionsUpdates {
+  added: Transaction[];
+  modified: Transaction[];
+  removed: RemovedTransaction[];
+  accessToken: string;
+  cursor: string;
+}
+
+
+
+export interface IPlaidItemCreatedEventPayload {
+  tenantId: number;
+  plaidAccessToken: string;
+  plaidItemId: string;
+  plaidInstitutionId: string;
+}

packages/server-nest/src/modules/BankingPlaid/utils.ts

@@ -0,0 +1,85 @@
+import * as R from 'ramda';
+import {
+  Item as PlaidItem,
+  Institution as PlaidInstitution,
+  AccountBase as PlaidAccount,
+  TransactionBase as PlaidTransactionBase,
+  AccountType as PlaidAccountType,
+} from 'plaid';
+import { ACCOUNT_TYPE } from '@/constants/accounts';
+import { IAccountCreateDTO } from '@/interfaces/Account';
+import { CreateUncategorizedTransactionDTO } from '../BankingCategorize/types/BankingCategorize.types';
+
+/**
+ * Retrieves the system account type from the given Plaid account type.
+ * @param {PlaidAccountType} plaidAccountType
+ * @returns {string}
+ */
+const getAccountTypeFromPlaidAccountType = (
+  plaidAccountType: PlaidAccountType
+) => {
+  if (plaidAccountType === PlaidAccountType.Credit) {
+    return ACCOUNT_TYPE.CREDIT_CARD;
+  }
+  return ACCOUNT_TYPE.BANK;
+};
+
+/**
+ * Transformes the Plaid account to create cashflow account DTO.
+ * @param {PlaidItem} item - Plaid item.
+ * @param {PlaidInstitution} institution - Plaid institution.
+ * @param {PlaidAccount} plaidAccount - Plaid account.
+ * @returns {IAccountCreateDTO}
+ */
+export const transformPlaidAccountToCreateAccount = R.curry(
+  (
+    item: PlaidItem,
+    institution: PlaidInstitution,
+    plaidAccount: PlaidAccount
+  ): IAccountCreateDTO => {
+    return {
+      name: `${institution.name} - ${plaidAccount.name}`,
+      code: '',
+      description: plaidAccount.official_name,
+      currencyCode: plaidAccount.balances.iso_currency_code,
+      accountType: getAccountTypeFromPlaidAccountType(plaidAccount.type),
+      active: true,
+      bankBalance: plaidAccount.balances.current,
+      accountMask: plaidAccount.mask,
+      plaidAccountId: plaidAccount.account_id,
+      plaidItemId: item.item_id,
+    };
+  }
+);
+
+/**
+ * Transformes the plaid transaction to cashflow create DTO.
+ * @param {number} cashflowAccountId - Cashflow account ID.
+ * @param {number} creditAccountId - Credit account ID.
+ * @param {PlaidTransaction} plaidTranasction - Plaid transaction.
+ * @returns {CreateUncategorizedTransactionDTO}
+ */
+export const transformPlaidTrxsToCashflowCreate = R.curry(
+  (
+    cashflowAccountId: number,
+    plaidTranasction: PlaidTransactionBase
+  ): CreateUncategorizedTransactionDTO => {
+    return {
+      date: plaidTranasction.date,
+
+      // Plaid: Positive values when money moves out of the account; negative values
+      // when money moves in. For example, debit card purchases are positive;
+      // credit card payments, direct deposits, and refunds are negative.
+      amount: -1 * plaidTranasction.amount,
+
+      description: plaidTranasction.name,
+      payee: plaidTranasction.payment_meta?.payee,
+      currencyCode: plaidTranasction.iso_currency_code,
+      accountId: cashflowAccountId,
+      referenceNo: plaidTranasction.payment_meta?.reference_number,
+      plaidTransactionId: plaidTranasction.transaction_id,
+      pending: plaidTranasction.pending,
+      pendingPlaidTransactionId: plaidTranasction.pending_transaction_id,
+    };
+  }
+);

packages/server-nest/src/modules/BankingTranasctionsRegonize/BankingTransactionsRegonize.module.ts

@@ -0,0 +1,26 @@
+import { Module } from '@nestjs/common';
+import { RegisterTenancyModel } from '../Tenancy/TenancyModels/Tenancy.module';
+import { RecognizedBankTransaction } from './models/RecognizedBankTransaction';
+import { GetAutofillCategorizeTransactionService } from './queries/GetAutofillCategorizeTransaction.service';
+import { RevertRecognizedTransactionsService } from './commands/RevertRecognizedTransactions.service';
+import { RecognizeTranasctionsService } from './commands/RecognizeTranasctions.service';
+import { TriggerRecognizedTransactionsSubscriber } from './events/TriggerRecognizedTransactions';
+
+const models = [RegisterTenancyModel(RecognizedBankTransaction)];
+
+@Module({
+  providers: [
+    ...models,
+    GetAutofillCategorizeTransactionService,
+    RevertRecognizedTransactionsService,
+    RecognizeTranasctionsService,
+    TriggerRecognizedTransactionsSubscriber,
+  ],
+  exports: [
+    ...models,
+    GetAutofillCategorizeTransactionService,
+    RevertRecognizedTransactionsService,
+    RecognizeTranasctionsService,
+  ],
+})
+export class BankingTransactionsRegonizeModule {}

packages/server-nest/src/modules/BankingTranasctionsRegonize/_types.ts

@@ -0,0 +1,11 @@
+export interface RevertRecognizedTransactionsCriteria {
+  batch?: string;
+  accountId?: number;
+}
+
+
+export interface RecognizeTransactionsCriteria {
+  batch?: string;
+  accountId?: number;
+}
+

packages/server-nest/src/modules/BankingTranasctionsRegonize/_utils.ts

@@ -0,0 +1,116 @@
+import { lowerCase } from 'lodash';
+import { UncategorizedBankTransaction } from '../BankingTransactions/models/UncategorizedBankTransaction';
+import { BankRuleApplyIfTransactionType, BankRuleConditionComparator, BankRuleConditionType, IBankRuleCondition } from '../BankRules/types';
+import { BankRule } from '../BankRules/models/BankRule';
+import { BankRuleCondition } from '../BankRules/models/BankRuleCondition';
+
+const conditionsMatch = (
+  transaction: UncategorizedBankTransaction,
+  conditions: BankRuleCondition[],
+  conditionsType: BankRuleConditionType = BankRuleConditionType.And
+) => {
+  const method =
+    conditionsType === BankRuleConditionType.And ? 'every' : 'some';
+
+  return conditions[method]((condition) => {
+    switch (determineFieldType(condition.field)) {
+      case 'number':
+        return matchNumberCondition(transaction, condition);
+      case 'text':
+        return matchTextCondition(transaction, condition);
+      default:
+        return false;
+    }
+  });
+};
+
+const matchNumberCondition = (
+  transaction: UncategorizedBankTransaction,
+  condition: BankRuleCondition
+) => {
+  const conditionValue = parseFloat(condition.value);
+  const transactionAmount =
+    condition.field === 'amount'
+      ? Math.abs(transaction[condition.field])
+      : (transaction[condition.field] as unknown as number);
+
+  switch (condition.comparator) {
+    case BankRuleConditionComparator.Equals:
+    case BankRuleConditionComparator.Equal:
+      return transactionAmount === conditionValue;
+
+    case BankRuleConditionComparator.BiggerOrEqual:
+      return transactionAmount >= conditionValue;
+
+    case BankRuleConditionComparator.Bigger:
+      return transactionAmount > conditionValue;
+
+    case BankRuleConditionComparator.Smaller:
+      return transactionAmount < conditionValue;
+
+    case BankRuleConditionComparator.SmallerOrEqual:
+      return transactionAmount <= conditionValue;
+
+    default:
+      return false;
+  }
+};
+
+const matchTextCondition = (
+  transaction: UncategorizedBankTransaction,
+  condition: BankRuleCondition
+): boolean => {
+  const transactionValue = transaction[condition.field] as string;
+
+  switch (condition.comparator) {
+    case BankRuleConditionComparator.Equals:
+    case BankRuleConditionComparator.Equal:
+      return transactionValue === condition.value;
+    case BankRuleConditionComparator.Contains:
+      const fieldValue = lowerCase(transactionValue);
+      const conditionValue = lowerCase(condition.value);
+
+      return fieldValue.includes(conditionValue);
+    case BankRuleConditionComparator.NotContain:
+      return !transactionValue?.includes(condition.value.toString());
+    default:
+      return false;
+  }
+};
+
+const matchTransactionType = (
+  bankRule: BankRule,
+  transaction: UncategorizedBankTransaction
+): boolean => {
+  return (
+    (transaction.isDepositTransaction &&
+      bankRule.applyIfTransactionType ===
+        BankRuleApplyIfTransactionType.Deposit) ||
+    (transaction.isWithdrawalTransaction &&
+      bankRule.applyIfTransactionType ===
+        BankRuleApplyIfTransactionType.Withdrawal)
+  );
+};
+
+export const bankRulesMatchTransaction = (
+  transaction: UncategorizedBankTransaction,
+  bankRules: BankRule[]
+) => {
+  return bankRules.find((rule) => {
+    return (
+      matchTransactionType(rule, transaction) &&
+      conditionsMatch(transaction, rule.conditions, rule.conditionsType)
+    );
+  });
+};
+
+const determineFieldType = (field: string): string => {
+  switch (field) {
+    case 'amount':
+      return 'number';
+    case 'description':
+    case 'payee':
+    default:
+      return 'text';
+  }
+};

packages/server-nest/src/modules/BankingTranasctionsRegonize/commands/RecognizeTranasctions.service.ts

@@ -0,0 +1,129 @@
+import { Knex } from 'knex';
+import { Inject, Injectable } from '@nestjs/common';
+import { castArray, isEmpty } from 'lodash';
+import { PromisePool } from '@supercharge/promise-pool';
+import { bankRulesMatchTransaction } from '../_utils';
+import { RecognizeTransactionsCriteria } from '../_types';
+import { BankRule } from '@/modules/BankRules/models/BankRule';
+import { RecognizedBankTransaction } from '../models/RecognizedBankTransaction';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { transformToMapBy } from '@/utils/transform-to-map-by';
+
+@Injectable()
+export class RecognizeTranasctionsService {
+  constructor(
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedCashflowTransactionModel: typeof UncategorizedBankTransaction,
+
+    @Inject(RecognizedBankTransaction.name)
+    private readonly recognizedBankTransactionModel: typeof RecognizedBankTransaction,
+
+    @Inject(BankRule.name)
+    private readonly bankRuleModel: typeof BankRule,
+  ) {}
+
+  /**
+   * Marks the uncategorized transaction as recognized from the given bank rule.
+   * @param {BankRule} bankRule -
+   * @param {UncategorizedCashflowTransaction} transaction -
+   * @param {Knex.Transaction} trx -
+   */
+  private async markBankRuleAsRecognized(
+    bankRule: BankRule,
+    transaction: UncategorizedBankTransaction,
+    trx?: Knex.Transaction,
+  ) {
+    const recognizedTransaction = await this.recognizedBankTransactionModel
+      .query(trx)
+      .insert({
+        bankRuleId: bankRule.id,
+        uncategorizedTransactionId: transaction.id,
+        assignedCategory: bankRule.assignCategory,
+        assignedAccountId: bankRule.assignAccountId,
+        assignedPayee: bankRule.assignPayee,
+        assignedMemo: bankRule.assignMemo,
+      });
+    await this.uncategorizedCashflowTransactionModel
+      .query(trx)
+      .findById(transaction.id)
+      .patch({
+        recognizedTransactionId: recognizedTransaction.id,
+      });
+  }
+
+  /**
+   * Regonized the uncategorized transactions.
+   * @param {number|Array<number>} ruleId - The target rule id/ids.
+   * @param {RecognizeTransactionsCriteria}
+   * @param {Knex.Transaction} trx -
+   */
+  public async recognizeTransactions(
+    ruleId?: number | Array<number>,
+    transactionsCriteria?: RecognizeTransactionsCriteria,
+    trx?: Knex.Transaction,
+  ) {
+    const uncategorizedTranasctions =
+      await this.uncategorizedCashflowTransactionModel
+        .query(trx)
+        .onBuild((query) => {
+          query.modify('notRecognized');
+          query.modify('notCategorized');
+
+          // Filter the transactions based on the given criteria.
+          if (transactionsCriteria?.batch) {
+            query.where('batch', transactionsCriteria.batch);
+          }
+          if (transactionsCriteria?.accountId) {
+            query.where('accountId', transactionsCriteria.accountId);
+          }
+        });
+
+    const bankRules = await this.bankRuleModel.query(trx).onBuild((q) => {
+      const rulesIds = !isEmpty(ruleId) ? castArray(ruleId) : [];
+
+      if (rulesIds?.length > 0) {
+        q.whereIn('id', rulesIds);
+      }
+      q.withGraphFetched('conditions');
+    });
+    const bankRulesByAccountId = transformToMapBy(
+      bankRules,
+      'applyIfAccountId',
+    );
+    // Try to recognize the transaction.
+    const regonizeTransaction = async (
+      transaction: UncategorizedBankTransaction,
+    ) => {
+      const allAccountsBankRules = bankRulesByAccountId.get(`null`);
+      const accountBankRules = bankRulesByAccountId.get(
+        `${transaction.accountId}`,
+      );
+      const recognizedBankRule = bankRulesMatchTransaction(
+        transaction,
+        accountBankRules,
+      );
+      if (recognizedBankRule) {
+        await this.markBankRuleAsRecognized(
+          recognizedBankRule,
+          transaction,
+          trx,
+        );
+      }
+    };
+    const result = await PromisePool.withConcurrency(MIGRATION_CONCURRENCY)
+      .for(uncategorizedTranasctions)
+      .process((transaction: UncategorizedBankTransaction, index, pool) => {
+        return regonizeTransaction(transaction);
+      });
+  }
+
+  /**
+   *
+   * @param {number} uncategorizedTransaction
+   */
+  public async regonizeTransaction(
+    uncategorizedTransaction: UncategorizedBankTransaction,
+  ) {}
+}
+
+const MIGRATION_CONCURRENCY = 10;

packages/server-nest/src/modules/BankingTranasctionsRegonize/commands/RevertRecognizedTransactions.service.ts

@@ -0,0 +1,70 @@
+import { castArray } from 'lodash';
+import { Knex } from 'knex';
+import { Inject, Injectable } from '@nestjs/common';
+import { RevertRecognizedTransactionsCriteria } from '../_types';
+import { RecognizedBankTransaction } from '../models/RecognizedBankTransaction';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+
+@Injectable()
+export class RevertRecognizedTransactionsService {
+  constructor(
+    private readonly uow: UnitOfWork,
+
+    @Inject(RecognizedBankTransaction.name)
+    private readonly recognizedBankTransactionModel: typeof RecognizedBankTransaction,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Revert and unlinks the recognized transactions based on the given bank rule
+   * and transactions criteria..
+   * @param {number|Array<number>} bankRuleId - Bank rule id.
+   * @param {RevertRecognizedTransactionsCriteria} transactionsCriteria -
+   * @param {Knex.Transaction} trx - Knex transaction.
+   * @returns {Promise<void>}
+   */
+  public async revertRecognizedTransactions(
+    ruleId?: number | Array<number>,
+    transactionsCriteria?: RevertRecognizedTransactionsCriteria,
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    const rulesIds = castArray(ruleId);
+
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Retrieves all the recognized transactions of the banbk rule.
+      const uncategorizedTransactions =
+        await this.uncategorizedBankTransactionModel.query(trx).onBuild((q) => {
+          q.withGraphJoined('recognizedTransaction');
+          q.whereNotNull('recognizedTransaction.id');
+
+          if (rulesIds.length > 0) {
+            q.whereIn('recognizedTransaction.bankRuleId', rulesIds);
+          }
+          if (transactionsCriteria?.accountId) {
+            q.where('accountId', transactionsCriteria.accountId);
+          }
+          if (transactionsCriteria?.batch) {
+            q.where('batch', transactionsCriteria.batch);
+          }
+        });
+      const uncategorizedTransactionIds = uncategorizedTransactions.map(
+        (r) => r.id,
+      );
+      // Unlink the recongized transactions out of uncategorized transactions.
+      await this.uncategorizedBankTransactionModel
+        .query(trx)
+        .whereIn('id', uncategorizedTransactionIds)
+        .patch({
+          recognizedTransactionId: null,
+        });
+      // Delete the recognized bank transactions that assocaited to bank rule.
+      await this.recognizedBankTransactionModel
+        .query(trx)
+        .whereIn('uncategorizedTransactionId', uncategorizedTransactionIds)
+        .delete();
+    }, trx);
+  }
+}

packages/server-nest/src/modules/BankingTranasctionsRegonize/events/TriggerRecognizedTransactions.ts

@@ -0,0 +1,83 @@
+import { isEqual, omit } from 'lodash';
+import { Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { events } from '@/common/events/events';
+import { IBankRuleEventCreatedPayload, IBankRuleEventDeletedPayload, IBankRuleEventEditedPayload } from '@/modules/BankRules/types';
+
+@Injectable()
+export class TriggerRecognizedTransactionsSubscriber {
+  /**
+   * Triggers the recognize uncategorized transactions job on rule created.
+   * @param {IBankRuleEventCreatedPayload} payload -
+   */
+  @OnEvent(events.bankRules.onCreated)
+  private async recognizedTransactionsOnRuleCreated({
+    bankRule,
+  }: IBankRuleEventCreatedPayload) {
+    const payload = { ruleId: bankRule.id };
+
+    // await this.agenda.now('recognize-uncategorized-transactions-job', payload);
+  }
+
+  /**
+   * Triggers the recognize uncategorized transactions job on rule edited.
+   * @param {IBankRuleEventEditedPayload} payload -
+   */
+  @OnEvent(events.bankRules.onEdited)
+  private async recognizedTransactionsOnRuleEdited({
+    editRuleDTO,
+    oldBankRule,
+    bankRule,
+  }: IBankRuleEventEditedPayload) {
+    const payload = { ruleId: bankRule.id };
+
+    // Cannot continue if the new and old bank rule values are the same,
+    // after excluding `createdAt` and `updatedAt` dates.
+    if (
+      isEqual(
+        omit(bankRule, ['createdAt', 'updatedAt']),
+        omit(oldBankRule, ['createdAt', 'updatedAt'])
+      )
+    ) {
+      return;
+    }
+    // await this.agenda.now(
+    //   'rerecognize-uncategorized-transactions-job',
+    //   payload
+    // );
+  }
+
+  /**
+   * Triggers the recognize uncategorized transactions job on rule deleted.
+   * @param {IBankRuleEventDeletedPayload} payload -
+   */
+  @OnEvent(events.bankRules.onDeleted)
+  private async recognizedTransactionsOnRuleDeleted({
+    ruleId,
+  }: IBankRuleEventDeletedPayload) {
+    const payload = { ruleId };
+
+    // await this.agenda.now(
+    //   'revert-recognized-uncategorized-transactions-job',
+    //   payload
+    // );
+  }
+
+  /**
+   * Triggers the recognize bank transactions once the imported file commit.
+   * @param {IImportFileCommitedEventPayload} payload -
+   */
+  @OnEvent(events.import.onImportCommitted)
+  private async triggerRecognizeTransactionsOnImportCommitted({
+    importId,
+  }: IImportFileCommitedEventPayload) {
+    const importFile = await Import.query().findOne({ importId });
+    const batch = importFile.paramsParsed.batch;
+    const payload = { transactionsCriteria: { batch } };
+
+    // Cannot continue if the imported resource is not bank account transactions.
+    if (importFile.resource !== 'UncategorizedCashflowTransaction') return;
+
+    // await this.agenda.now('recognize-uncategorized-transactions-job', payload);
+  }
+}

packages/server-nest/src/modules/BankingTranasctionsRegonize/jobs/RecognizeTransactionsJob.ts

@@ -0,0 +1,36 @@
+// import Container, { Service } from 'typedi';
+// import { RecognizeTranasctionsService } from '../commands/RecognizeTranasctions.service';
+
+// @Service()
+// export class RegonizeTransactionsJob {
+//   /**
+//    * Constructor method.
+//    */
+//   constructor(agenda) {
+//     agenda.define(
+//       'recognize-uncategorized-transactions-job',
+//       { priority: 'high', concurrency: 2 },
+//       this.handler
+//     );
+//   }
+
+//   /**
+//    * Triggers sending invoice mail.
+//    */
+//   private handler = async (job, done: Function) => {
+//     const { tenantId, ruleId, transactionsCriteria } = job.attrs.data;
+//     const regonizeTransactions = Container.get(RecognizeTranasctionsService);
+
+//     try {
+//       await regonizeTransactions.recognizeTransactions(
+//         tenantId,
+//         ruleId,
+//         transactionsCriteria
+//       );
+//       done();
+//     } catch (error) {
+//       console.log(error);
+//       done(error);
+//     }
+//   };
+// }

packages/server-nest/src/modules/BankingTranasctionsRegonize/jobs/RerecognizeTransactionsJob.ts

@@ -0,0 +1,45 @@
+// import Container, { Service } from 'typedi';
+// import { RecognizeTranasctionsService } from '../commands/RecognizeTranasctions.service';
+// import { RevertRecognizedTransactions } from '../commands/RevertRecognizedTransactions.service';
+
+// @Service()
+// export class ReregonizeTransactionsJob {
+//   /**
+//    * Constructor method.
+//    */
+//   constructor(agenda) {
+//     agenda.define(
+//       'rerecognize-uncategorized-transactions-job',
+//       { priority: 'high', concurrency: 2 },
+//       this.handler
+//     );
+//   }
+
+//   /**
+//    * Triggers sending invoice mail.
+//    */
+//   private handler = async (job, done: Function) => {
+//     const { tenantId, ruleId, transactionsCriteria } = job.attrs.data;
+//     const regonizeTransactions = Container.get(RecognizeTranasctionsService);
+//     const revertRegonizedTransactions = Container.get(
+//       RevertRecognizedTransactions
+//     );
+
+//     try {
+//       await revertRegonizedTransactions.revertRecognizedTransactions(
+//         tenantId,
+//         ruleId,
+//         transactionsCriteria
+//       );
+//       await regonizeTransactions.recognizeTransactions(
+//         tenantId,
+//         ruleId,
+//         transactionsCriteria
+//       );
+//       done();
+//     } catch (error) {
+//       console.log(error);
+//       done(error);
+//     }
+//   };
+// }

packages/server-nest/src/modules/BankingTranasctionsRegonize/jobs/RevertRecognizedTransactionsJob.ts

@@ -0,0 +1,38 @@
+// import Container, { Service } from 'typedi';
+// import { RevertRecognizedTransactions } from '../commands/RevertRecognizedTransactions.service';
+
+// @Service()
+// export class RevertRegonizeTransactionsJob {
+//   /**
+//    * Constructor method.
+//    */
+//   constructor(agenda) {
+//     agenda.define(
+//       'revert-recognized-uncategorized-transactions-job',
+//       { priority: 'high', concurrency: 2 },
+//       this.handler
+//     );
+//   }
+
+//   /**
+//    * Triggers sending invoice mail.
+//    */
+//   private handler = async (job, done: Function) => {
+//     const { tenantId, ruleId, transactionsCriteria } = job.attrs.data;
+//     const revertRegonizedTransactions = Container.get(
+//       RevertRecognizedTransactions
+//     );
+
+//     try {
+//       await revertRegonizedTransactions.revertRecognizedTransactions(
+//         tenantId,
+//         ruleId,
+//         transactionsCriteria
+//       );
+//       done();
+//     } catch (error) {
+//       console.log(error);
+//       done(error);
+//     }
+//   };
+// }

packages/server-nest/src/modules/BankingTranasctionsRegonize/models/RecognizedBankTransaction.ts

@@ -0,0 +1,79 @@
+import { BaseModel } from '@/models/Model';
+import { Model } from 'objection';
+
+export class RecognizedBankTransaction extends BaseModel {
+  public bankRuleId!: number;
+  public uncategorizedTransactionId!: number;
+  public assignedCategory!: string;
+  public assignedAccountId!: number;
+  public assignedPayee!: string;
+  public assignedMemo!: string;
+
+  /**
+   * Table name.
+   */
+  static get tableName() {
+    return 'recognized_bank_transactions';
+  }
+
+  /**
+   * Timestamps columns.
+   */
+  get timestamps() {
+    return [];
+  }
+
+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return [];
+  }
+
+  /**
+   * Relationship mapping.
+   */
+  static get relationMappings() {
+    const UncategorizedCashflowTransaction = require('./UncategorizedCashflowTransaction');
+    const Account = require('./Account');
+    const { BankRule } = require('./BankRule');
+
+    return {
+      /**
+       * Recognized bank transaction may belongs to uncategorized transactions.
+       */
+      uncategorizedTransactions: {
+        relation: Model.HasManyRelation,
+        modelClass: UncategorizedCashflowTransaction.default,
+        join: {
+          from: 'recognized_bank_transactions.uncategorizedTransactionId',
+          to: 'uncategorized_cashflow_transactions.id',
+        },
+      },
+
+      /**
+       * Recognized bank transaction may belongs to assign account.
+       */
+      assignAccount: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: Account.default,
+        join: {
+          from: 'recognized_bank_transactions.assignedAccountId',
+          to: 'accounts.id',
+        },
+      },
+
+      /**
+       * Recognized bank transaction may belongs to bank rule.
+       */
+      bankRule: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: BankRule,
+        join: {
+          from: 'recognized_bank_transactions.bankRuleId',
+          to: 'bank_rules.id',
+        },
+      },
+    };
+  }
+}

packages/server-nest/src/modules/BankingTranasctionsRegonize/queries/GetAutofillCategorizeTransaction.service.ts

@@ -0,0 +1,42 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { castArray, first, uniq } from 'lodash';
+import { GetAutofillCategorizeTransctionTransformer } from './GetAutofillCategorizeTransactionTransformer';
+import { UncategorizedBankTransaction } from '@/modules/BankingTransactions/models/UncategorizedBankTransaction';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+
+@Injectable()
+export class GetAutofillCategorizeTransactionService {
+  constructor(
+    private readonly transformer: TransformerInjectable,
+
+    @Inject(UncategorizedBankTransaction.name)
+    private readonly uncategorizedBankTransactionModel: typeof UncategorizedBankTransaction,
+  ) {}
+
+  /**
+   * Retrieves the autofill values of categorize transactions form.
+   * @param {Array<number> | number} uncategorizeTransactionsId - Uncategorized transactions ids.
+   */
+  public async getAutofillCategorizeTransaction(
+    uncategorizeTransactionsId: Array<number> | number
+  ) {
+    const uncategorizeTransactionsIds = uniq(
+      castArray(uncategorizeTransactionsId)
+    );
+    const uncategorizedTransactions =
+      await this.uncategorizedBankTransactionModel.query()
+        .whereIn('id', uncategorizeTransactionsIds)
+        .withGraphFetched('recognizedTransaction.assignAccount')
+        .withGraphFetched('recognizedTransaction.bankRule')
+        .throwIfNotFound();
+
+    return this.transformer.transform(
+      {},
+      new GetAutofillCategorizeTransctionTransformer(),
+      {
+        uncategorizedTransactions,
+        firstUncategorizedTransaction: first(uncategorizedTransactions),
+      }
+    );
+  }
+}

packages/server-nest/src/modules/BankingTranasctionsRegonize/queries/GetAutofillCategorizeTransactionTransformer.ts

@@ -0,0 +1,176 @@
+import { sumBy } from 'lodash';
+import { Transformer } from '@/modules/Transformer/Transformer';
+
+export class GetAutofillCategorizeTransctionTransformer extends Transformer {
+  /**
+   * Included attributes to the object.
+   * @returns {Array}
+   */
+  public includeAttributes = (): string[] => {
+    return [
+      'amount',
+      'formattedAmount',
+      'isRecognized',
+      'date',
+      'formattedDate',
+      'creditAccountId',
+      'debitAccountId',
+      'referenceNo',
+      'transactionType',
+      'recognizedByRuleId',
+      'recognizedByRuleName',
+      'isWithdrawalTransaction',
+      'isDepositTransaction',
+    ];
+  };
+
+  /**
+   * Detarmines whether the transaction is recognized.
+   * @returns {boolean}
+   */
+  public isRecognized() {
+    return !!this.options.firstUncategorizedTransaction?.recognizedTransaction;
+  }
+
+  /**
+   * Retrieves the total amount of uncategorized transactions.
+   * @returns {number}
+   */
+  public amount() {
+    return sumBy(this.options.uncategorizedTransactions, 'amount');
+  }
+
+  /**
+   * Retrieves the formatted total amount of uncategorized transactions.
+   * @returns {string}
+   */
+  public formattedAmount() {
+    return this.formatNumber(this.amount(), {
+      currencyCode: 'USD',
+      money: true,
+    });
+  }
+
+  /**
+   * Detarmines whether the transaction is deposit.
+   * @returns {boolean}
+   */
+  public isDepositTransaction() {
+    const amount = this.amount();
+
+    return amount > 0;
+  }
+
+  /**
+   * Detarmines whether the transaction is withdrawal.
+   * @returns {boolean}
+   */
+  public isWithdrawalTransaction() {
+    const amount = this.amount();
+
+    return amount < 0;
+  }
+
+  /**
+   *
+   * @param {string}
+   */
+  public date() {
+    return this.options.firstUncategorizedTransaction?.date || null;
+  }
+
+  /**
+   * Retrieves the formatted date of uncategorized transaction.
+   * @returns {string}
+   */
+  public formattedDate() {
+    return this.formatDate(this.date());
+  }
+
+  /**
+   *
+   * @param {string}
+   */
+  public referenceNo() {
+    return this.options.firstUncategorizedTransaction?.referenceNo || null;
+  }
+
+  /**
+   *
+   * @returns {number}
+   */
+  public creditAccountId() {
+    return (
+      this.options.firstUncategorizedTransaction?.recognizedTransaction
+        ?.assignedAccountId || null
+    );
+  }
+
+  /**
+   *
+   * @returns {number}
+   */
+  public debitAccountId() {
+    return this.options.firstUncategorizedTransaction?.accountId || null;
+  }
+
+  /**
+   * Retrieves the assigned category of recognized transaction, if is not recognized
+   * returns the default transaction type depends on the transaction normal.
+   * @returns {string}
+   */
+  public transactionType() {
+    const assignedCategory =
+      this.options.firstUncategorizedTransaction?.recognizedTransaction
+        ?.assignedCategory;
+
+    return (
+      assignedCategory ||
+      (this.isDepositTransaction() ? 'other_income' : 'other_expense')
+    );
+  }
+
+  /**
+   *
+   * @returns {string}
+   */
+  public payee() {
+    return (
+      this.options.firstUncategorizedTransaction?.recognizedTransaction
+        ?.assignedPayee || null
+    );
+  }
+
+  /**
+   *
+   * @returns {string}
+   */
+  public memo() {
+    return (
+      this.options.firstUncategorizedTransaction?.recognizedTransaction
+        ?.assignedMemo || null
+    );
+  }
+
+  /**
+   * Retrieves the rule id the transaction recongized by.
+   * @returns {string}
+   */
+  public recognizedByRuleId() {
+    return (
+      this.options.firstUncategorizedTransaction?.recognizedTransaction
+        ?.bankRuleId || null
+    );
+  }
+
+  /**
+   * Retrieves the rule name the transaction recongized by.
+   * @returns {string}
+   */
+  public recognizedByRuleName() {
+    return (
+      this.options.firstUncategorizedTransaction?.recognizedTransaction
+        ?.bankRule?.name || null
+    );
+  }
+}

packages/server-nest/src/modules/BankingTransactions/BankingTransactions.module.ts

@@ -0,0 +1,35 @@
+import { Module } from '@nestjs/common';
+import { RegisterTenancyModel } from '../Tenancy/TenancyModels/Tenancy.module';
+import { UncategorizedBankTransaction } from './models/UncategorizedBankTransaction';
+import { BankTransactionLine } from './models/BankTransactionLine';
+import { BankTransaction } from './models/BankTransaction';
+import { BankTransactionAutoIncrement } from './commands/BankTransactionAutoIncrement.service';
+import BankingTransactionGLEntriesSubscriber from './subscribers/CashflowTransactionSubscriber';
+import { DecrementUncategorizedTransactionOnCategorizeSubscriber } from './subscribers/DecrementUncategorizedTransactionOnCategorize';
+import { DeleteCashflowTransactionOnUncategorizeSubscriber } from './subscribers/DeleteCashflowTransactionOnUncategorize';
+import { PreventDeleteTransactionOnDeleteSubscriber } from './subscribers/PreventDeleteTransactionsOnDelete';
+import { ValidateDeleteBankAccountTransactions } from './commands/ValidateDeleteBankAccountTransactions.service';
+import { BankTransactionGLEntriesService } from './commands/BankTransactionGLEntries';
+import { BankingTransactionsApplication } from './BankingTransactionsApplication.service';
+
+const models = [
+  RegisterTenancyModel(UncategorizedBankTransaction),
+  RegisterTenancyModel(BankTransaction),
+  RegisterTenancyModel(BankTransactionLine),
+];
+
+@Module({
+  exports: [
+    BankTransactionAutoIncrement,
+    BankTransactionGLEntriesService,
+    ValidateDeleteBankAccountTransactions,
+    BankingTransactionGLEntriesSubscriber,
+    DecrementUncategorizedTransactionOnCategorizeSubscriber,
+    DeleteCashflowTransactionOnUncategorizeSubscriber,
+    PreventDeleteTransactionOnDeleteSubscriber,
+    BankingTransactionsApplication,
+    ...models,
+  ],
+  providers: [...models],
+})
+export class BankingTransactionsModule {}

packages/server-nest/src/modules/BankingTransactions/BankingTransactionsApplication.service.ts

@@ -0,0 +1,58 @@
+import { Knex } from 'knex';
+import { DeleteCashflowTransaction } from './commands/DeleteCashflowTransaction.service';
+import { CreateBankTransactionService } from './commands/CreateBankTransaction.service';
+import { GetBankTransactionService } from './queries/GetBankTransaction.service';
+import { ICashflowNewCommandDTO } from './types/BankingTransactions.types';
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class BankingTransactionsApplication {
+  constructor(
+    private readonly createTransactionService: CreateBankTransactionService,
+    private readonly deleteTransactionService: DeleteCashflowTransaction,
+    private readonly getCashflowTransactionService: GetBankTransactionService,
+    // private readonly getCashflowAccountsService: GetBankingAccountsServic,
+  ) {}
+
+  /**
+   * Creates a new cashflow transaction.
+   * @param {ICashflowNewCommandDTO} transactionDTO
+   * @returns
+   */
+  public createTransaction(transactionDTO: ICashflowNewCommandDTO) {
+    return this.createTransactionService.newCashflowTransaction(transactionDTO);
+  }
+
+  /**
+   * Deletes the given cashflow transaction.
+   * @param {number} cashflowTransactionId - Cashflow transaction id.
+   * @returns {Promise<{ oldCashflowTransaction: ICashflowTransaction }>}
+   */
+  public deleteTransaction(cashflowTransactionId: number) {
+    return this.deleteTransactionService.deleteCashflowTransaction(
+      cashflowTransactionId,
+    );
+  }
+
+  /**
+   * Retrieves specific cashflow transaction.
+   * @param {number} cashflowTransactionId
+   * @returns
+   */
+  public getTransaction(cashflowTransactionId: number) {
+    return this.getCashflowTransactionService.getBankTransaction(
+      cashflowTransactionId,
+    );
+  }
+
+  /**
+   * Retrieves the cashflow accounts.
+   * @param {ICashflowAccountsFilter} filterDTO
+   * @returns
+   */
+  public getCashflowAccounts(
+    // filterDTO: ICashflowAccountsFilter,
+  ) {
+    // return this.getCashflowAccountsService.getCashflowAccounts(filterDTO);
+  }
+}

packages/server-nest/src/modules/BankingTransactions/commands/BankTransactionAutoIncrement.service.ts

@@ -0,0 +1,26 @@
+import { Injectable } from '@nestjs/common';
+import { AutoIncrementOrdersService } from '../../AutoIncrementOrders/AutoIncrementOrders.service';
+
+@Injectable()
+export class BankTransactionAutoIncrement {
+  constructor(
+    private readonly autoIncrementOrdersService: AutoIncrementOrdersService,
+  ) {}
+
+  /**
+   * Retrieve the next unique invoice number.
+   * @return {string}
+   */
+  public getNextTransactionNumber = (): string => {
+    return this.autoIncrementOrdersService.getNextTransactionNumber('cashflow');
+  };
+
+  /**
+   * Increment the invoice next number.
+   */
+  public incrementNextTransactionNumber = () => {
+    return this.autoIncrementOrdersService.incrementSettingsNextNumber(
+      'cashflow',
+    );
+  };
+}

packages/server-nest/src/modules/BankingTransactions/commands/BankTransactionGL.ts

@@ -0,0 +1,102 @@
+import { ILedgerEntry } from '@/modules/Ledger/types/Ledger.types';
+import { BankTransaction } from '../models/BankTransaction';
+import { transformCashflowTransactionType } from '../utils';
+import { Ledger } from '@/modules/Ledger/Ledger';
+
+export class BankTransactionGL {
+  private bankTransactionModel: BankTransaction;
+  /**
+   * @param {BankTransaction} bankTransactionModel - The bank transaction model.
+   */
+  constructor(bankTransactionModel: BankTransaction) {
+    this.bankTransactionModel = bankTransactionModel;
+  }
+
+  /**
+   * Retrieves the common entry of cashflow transaction.
+   * @returns {Partial<ILedgerEntry>}
+   */
+  private get commonEntry() {
+    const { entries, ...transaction } = this.bankTransactionModel;
+
+    return {
+      date: this.bankTransactionModel.date,
+      currencyCode: this.bankTransactionModel.currencyCode,
+      exchangeRate: this.bankTransactionModel.exchangeRate,
+
+      transactionType: 'CashflowTransaction',
+      transactionId: this.bankTransactionModel.id,
+      transactionNumber: this.bankTransactionModel.transactionNumber,
+      transactionSubType: transformCashflowTransactionType(
+        this.bankTransactionModel.transactionType,
+      ),
+      referenceNumber: this.bankTransactionModel.referenceNo,
+
+      note: this.bankTransactionModel.description,
+
+      branchId: this.bankTransactionModel.branchId,
+      userId: this.bankTransactionModel.userId,
+    };
+  }
+
+  /**
+   * Retrieves the cashflow debit GL entry.
+   * @returns {ILedgerEntry}
+   */
+  private get cashflowDebitGLEntry(): ILedgerEntry {
+    const commonEntry = this.commonEntry;
+
+    return {
+      ...commonEntry,
+      accountId: this.bankTransactionModel.cashflowAccountId,
+      credit: this.bankTransactionModel.isCashCredit
+        ? this.bankTransactionModel.localAmount
+        : 0,
+      debit: this.bankTransactionModel.isCashDebit
+        ? this.bankTransactionModel.localAmount
+        : 0,
+      accountNormal: this.bankTransactionModel?.cashflowAccount?.accountNormal,
+      index: 1,
+    };
+  }
+
+  /**
+   * Retrieves the cashflow credit GL entry.
+   * @returns {ILedgerEntry}
+   */
+  private get cashflowCreditGLEntry(): ILedgerEntry {
+    return {
+      ...this.commonEntry,
+      credit: this.bankTransactionModel.isCashDebit
+        ? this.bankTransactionModel.localAmount
+        : 0,
+      debit: this.bankTransactionModel.isCashCredit
+        ? this.bankTransactionModel.localAmount
+        : 0,
+      accountId: this.bankTransactionModel.creditAccountId,
+      accountNormal: this.bankTransactionModel.creditAccount.accountNormal,
+      index: 2,
+    };
+  }
+
+  /**
+   * Retrieves the cashflow transaction GL entry.
+   * @returns {ILedgerEntry[]}
+   */
+  private getJournalEntries(): ILedgerEntry[] {
+    const debitEntry = this.cashflowDebitGLEntry;
+    const creditEntry = this.cashflowCreditGLEntry;
+
+    return [debitEntry, creditEntry];
+  }
+
+  /**
+   * Retrieves the cashflow GL ledger.
+   * @returns {Ledger}
+   */
+  public getCashflowLedger() {
+    const entries = this.getJournalEntries();
+
+    return new Ledger(entries);
+  }
+}

packages/server-nest/src/modules/BankingTransactions/commands/BankTransactionGLEntries.ts

@@ -0,0 +1,54 @@
+import { Knex } from 'knex';
+import { Inject, Injectable } from '@nestjs/common';
+import { LedgerStorageService } from '@/modules/Ledger/LedgerStorage.service';
+import { BankTransaction } from '../models/BankTransaction';
+import { BankTransactionGL } from './BankTransactionGL';
+
+@Injectable()
+export class BankTransactionGLEntriesService {
+  constructor(
+    private readonly ledgerStorage: LedgerStorageService,
+
+    @Inject(BankTransaction.name)
+    private readonly bankTransactionModel: typeof BankTransaction,
+  ) {}
+
+  /**
+   * Write the journal entries of the given cashflow transaction.
+   * @param {number} tenantId
+   * @param {ICashflowTransaction} cashflowTransaction
+   * @return {Promise<void>}
+   */
+  public writeJournalEntries = async (
+    cashflowTransactionId: number,
+    trx?: Knex.Transaction,
+  ): Promise<void> => {
+    // Retrieves the cashflow transactions with associated entries.
+    const transaction = await this.bankTransactionModel
+      .query(trx)
+      .findById(cashflowTransactionId)
+      .withGraphFetched('cashflowAccount')
+      .withGraphFetched('creditAccount');
+
+    // Retrieves the cashflow transaction ledger.
+    const ledger = new BankTransactionGL(transaction).getCashflowLedger();
+
+    await this.ledgerStorage.commit(ledger, trx);
+  };
+
+  /**
+   * Delete the journal entries.
+   * @param {number} cashflowTransactionId - Cashflow transaction id.
+   * @return {Promise<void>}
+   */
+  public revertJournalEntries = async (
+    cashflowTransactionId: number,
+    trx?: Knex.Transaction,
+  ): Promise<void> => {
+    await this.ledgerStorage.deleteByReference(
+      cashflowTransactionId,
+      'CashflowTransaction',
+      trx,
+    );
+  };
+}

packages/server-nest/src/modules/BankingTransactions/commands/CommandCasflowValidator.service.ts

@@ -0,0 +1,109 @@
+import { includes, camelCase, upperFirst, sumBy } from 'lodash';
+import { getCashflowTransactionType } from '../utils';
+import {
+  CASHFLOW_DIRECTION,
+  CASHFLOW_TRANSACTION_TYPE,
+  ERRORS,
+} from '../constants';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { Injectable } from '@nestjs/common';
+import { ServiceError } from '@/modules/Items/ServiceError';
+import { BankTransaction } from '../models/BankTransaction';
+import { UncategorizedBankTransaction } from '../models/UncategorizedBankTransaction';
+
+@Injectable()
+export class CommandBankTransactionValidator {
+  /**
+   * Validates the lines accounts type should be cash or bank account.
+   * @param {Account} accounts -
+   */
+  public validateCreditAccountWithCashflowType = (
+    creditAccount: Account,
+    cashflowTransactionType: CASHFLOW_TRANSACTION_TYPE
+  ): void => {
+    const transactionTypeMeta = getCashflowTransactionType(
+      cashflowTransactionType
+    );
+    const noneCashflowAccount = !includes(
+      transactionTypeMeta.creditType,
+      creditAccount.accountType
+    );
+    if (noneCashflowAccount) {
+      throw new ServiceError(ERRORS.CREDIT_ACCOUNTS_HAS_INVALID_TYPE);
+    }
+  };
+
+  /**
+   * Validates the cashflow transaction type.
+   * @param {string} transactionType
+   * @returns {string}
+   */
+  public validateCashflowTransactionType = (transactionType: string) => {
+    const transformedType = upperFirst(
+      camelCase(transactionType)
+    ) as CASHFLOW_TRANSACTION_TYPE;
+
+    // Retrieve the given transaction type meta.
+    const transactionTypeMeta = getCashflowTransactionType(transformedType);
+
+    // Throw service error in case not the found the given transaction type.
+    if (!transactionTypeMeta) {
+      throw new ServiceError(ERRORS.CASHFLOW_TRANSACTION_TYPE_INVALID);
+    }
+    return transformedType;
+  };
+
+  /**
+   * Validate the given transaction should be categorized.
+   * @param {CashflowTransaction} cashflowTransaction
+   */
+  public validateTransactionShouldCategorized(
+    cashflowTransaction: BankTransaction
+  ) {
+    if (!cashflowTransaction.uncategorize) {
+      throw new ServiceError(ERRORS.TRANSACTION_ALREADY_CATEGORIZED);
+    }
+  }
+
+  /**
+   * Validate the given transcation shouldn't be categorized.
+   * @param {CashflowTransaction} cashflowTransaction
+   */
+  public validateTransactionsShouldNotCategorized(
+    cashflowTransactions: Array<UncategorizedBankTransaction>
+  ) {
+    const categorized = cashflowTransactions.filter((t) => t.categorized);
+
+    if (categorized?.length > 0) {
+      throw new ServiceError(ERRORS.TRANSACTION_ALREADY_CATEGORIZED, '', {
+        ids: categorized.map((t) => t.id),
+      });
+    }
+  }
+
+  /**
+   * Validate the uncategorize transaction type.
+   * @param {uncategorizeTransaction}
+   * @param {string} transactionType
+   * @throws {ServiceError(ERRORS.UNCATEGORIZED_TRANSACTION_TYPE_INVALID)}
+   */
+  public validateUncategorizeTransactionType(
+    uncategorizeTransactions: Array<UncategorizedBankTransaction>,
+    transactionType: string
+  ) {
+    const amount = sumBy(uncategorizeTransactions, 'amount');
+    const isDepositTransaction = amount > 0;
+    const isWithdrawalTransaction = amount <= 0;
+
+    const type = getCashflowTransactionType(
+      transactionType as CASHFLOW_TRANSACTION_TYPE
+    );
+    if (
+      (type.direction === CASHFLOW_DIRECTION.IN && isDepositTransaction) ||
+      (type.direction === CASHFLOW_DIRECTION.OUT && isWithdrawalTransaction)
+    ) {
+      return;
+    }
+    throw new ServiceError(ERRORS.UNCATEGORIZED_TRANSACTION_TYPE_INVALID);
+  }
+}

packages/server-nest/src/modules/BankingTransactions/commands/CreateBankTransaction.service.ts

@@ -0,0 +1,168 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { pick } from 'lodash';
+import { Knex } from 'knex';
+import * as R from 'ramda';
+import { CASHFLOW_TRANSACTION_TYPE } from '../constants';
+import { transformCashflowTransactionType } from '../utils';
+import { CommandBankTransactionValidator } from './CommandCasflowValidator.service';
+import { BankTransactionAutoIncrement } from './BankTransactionAutoIncrement.service';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { BranchTransactionDTOTransformer } from '@/modules/Branches/integrations/BranchTransactionDTOTransform';
+import { events } from '@/common/events/events';
+import { Account } from '@/modules/Accounts/models/Account.model';
+import { BankTransaction } from '../models/BankTransaction';
+import {
+  ICashflowNewCommandDTO,
+  ICommandCashflowCreatedPayload,
+  ICommandCashflowCreatingPayload,
+} from '../types/BankingTransactions.types';
+
+@Injectable()
+export class CreateBankTransactionService {
+  constructor(
+    private validator: CommandBankTransactionValidator,
+    private uow: UnitOfWork,
+    private eventPublisher: EventEmitter2,
+    private autoIncrement: BankTransactionAutoIncrement,
+    private branchDTOTransform: BranchTransactionDTOTransformer,
+
+    @Inject(BankTransaction.name)
+    private bankTransactionModel: typeof BankTransaction,
+
+    @Inject(Account.name)
+    private accountModel: typeof Account,
+  ) {}
+
+  /**
+   * Authorize the cashflow creating transaction.
+   * @param {ICashflowNewCommandDTO} newCashflowTransactionDTO
+   */
+  public authorize = async (
+    newCashflowTransactionDTO: ICashflowNewCommandDTO,
+    creditAccount: Account,
+  ) => {
+    const transactionType = transformCashflowTransactionType(
+      newCashflowTransactionDTO.transactionType,
+    );
+    // Validates the cashflow transaction type.
+    this.validator.validateCashflowTransactionType(transactionType);
+
+    // Retrieve accounts of the cashflow lines object.
+    this.validator.validateCreditAccountWithCashflowType(
+      creditAccount,
+      transactionType as CASHFLOW_TRANSACTION_TYPE,
+    );
+  };
+
+  /**
+   * Transformes owner contribution DTO to cashflow transaction.
+   * @param {ICashflowNewCommandDTO} newCashflowTransactionDTO - New transaction DTO.
+   * @returns {ICashflowTransactionInput} - Cashflow transaction object.
+   */
+  private transformCashflowTransactionDTO = (
+    newCashflowTransactionDTO: ICashflowNewCommandDTO,
+    cashflowAccount: Account,
+    userId: number,
+  ): BankTransaction => {
+    const amount = newCashflowTransactionDTO.amount;
+
+    const fromDTO = pick(newCashflowTransactionDTO, [
+      'date',
+      'referenceNo',
+      'description',
+      'transactionType',
+      'exchangeRate',
+      'cashflowAccountId',
+      'creditAccountId',
+      'branchId',
+      'plaidTransactionId',
+      'uncategorizedTransactionId',
+    ]);
+    // Retreive the next invoice number.
+    const autoNextNumber = this.autoIncrement.getNextTransactionNumber();
+
+    // Retrieve the transaction number.
+    const transactionNumber =
+      newCashflowTransactionDTO.transactionNumber || autoNextNumber;
+
+    const initialDTO = {
+      amount,
+      ...fromDTO,
+      transactionNumber,
+      currencyCode: cashflowAccount.currencyCode,
+      exchangeRate: fromDTO?.exchangeRate || 1,
+      transactionType: transformCashflowTransactionType(
+        fromDTO.transactionType,
+      ),
+      userId,
+      ...(newCashflowTransactionDTO.publish
+        ? {
+            publishedAt: new Date(),
+          }
+        : {}),
+    };
+    return R.compose(this.branchDTOTransform.transformDTO<BankTransaction>)(
+      initialDTO,
+    ) as BankTransaction;
+  };
+
+  /**
+   * Owner contribution money in.
+   * @param {ICashflowOwnerContributionDTO} ownerContributionDTO
+   * @param {number} userId - User id.
+   * @returns {Promise<ICashflowTransaction>}
+   */
+  public newCashflowTransaction = async (
+    newTransactionDTO: ICashflowNewCommandDTO,
+    userId?: number,
+  ): Promise<BankTransaction> => {
+    // Retrieves the cashflow account or throw not found error.
+    const cashflowAccount = await this.accountModel
+      .query()
+      .findById(newTransactionDTO.cashflowAccountId)
+      .throwIfNotFound();
+
+    // Retrieves the credit account or throw not found error.
+    const creditAccount = await this.accountModel
+      .query()
+      .findById(newTransactionDTO.creditAccountId)
+      .throwIfNotFound();
+
+    // Authorize before creating cashflow transaction.
+    await this.authorize(newTransactionDTO, creditAccount);
+
+    // Transformes owner contribution DTO to cashflow transaction.
+    const cashflowTransactionObj = this.transformCashflowTransactionDTO(
+      newTransactionDTO,
+      cashflowAccount,
+      userId,
+    );
+    // Creates a new cashflow transaction under UOW envirement.
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onCashflowTransactionCreate` event.
+      await this.eventPublisher.emitAsync(
+        events.cashflow.onTransactionCreating,
+        {
+          trx,
+          newTransactionDTO,
+        } as ICommandCashflowCreatingPayload,
+      );
+      // Inserts cashflow owner contribution transaction.
+      const cashflowTransaction = await this.bankTransactionModel
+        .query(trx)
+        .upsertGraph(cashflowTransactionObj);
+
+      // Triggers `onCashflowTransactionCreated` event.
+      await this.eventPublisher.emitAsync(
+        events.cashflow.onTransactionCreated,
+        {
+          newTransactionDTO,
+          cashflowTransaction,
+          trx,
+        } as ICommandCashflowCreatedPayload,
+      );
+      return cashflowTransaction;
+    });
+  };
+}