feat: Payment system with voucher cards.

feat: Design with inversion dependency injection architecture.
feat: Prettier http middleware.
feat: Re-write items categories with preferred accounts.

server/src/services/Subscription/SubscriptionService.ts

@@ -0,0 +1,36 @@
+import { Service } from 'typedi';
+import { Plan, Tenant, Voucher } from '@/system/models';
+import Subscription from '@/services/Subscription/Subscription';
+import VocuherPaymentMethod from '@/services/Payment/VoucherPaymentMethod';
+import PaymentContext from '@/services/Payment';
+
+@Service()
+export default class SubscriptionService {
+  /**
+   * Handles the payment process via voucher code and than subscribe to 
+   * the given tenant.
+   * 
+   * @param {number} tenantId 
+   * @param {String} planSlug 
+   * @param {string} voucherCode 
+   * 
+   * @return {Promise}
+   */
+  async subscriptionViaVoucher(
+    tenantId: number,
+    planSlug: string,
+    voucherCode: string,
+    subscriptionSlug: string = 'main',
+  ) {
+    const plan = await Plan.query().findOne('slug', planSlug);
+    const tenant = await Tenant.query().findById(tenantId);
+    const voucherModel = await Voucher.query().findOne('voucher_code', voucherCode);
+
+    const paymentViaVoucher = new VocuherPaymentMethod();
+    const paymentContext = new PaymentContext(paymentViaVoucher);
+
+    const subscription = new Subscription(paymentContext);
+
+    return subscription.subscribe(tenant, plan, voucherModel, subscriptionSlug);
+  }
+}