feat: Download invoice pdf of the payment link

packages/server/src/services/PaymentLinks/GetPaymentLinkInvoicePdf.ts

@@ -0,0 +1,33 @@
+import { Inject, Service } from 'typedi';
+import { initalizeTenantServices } from '@/api/middleware/TenantDependencyInjection';
+import { SaleInvoicePdf } from '../Sales/Invoices/SaleInvoicePdf';
+import { PaymentLink } from '@/system/models';
+
+@Service()
+export class GetPaymentLinkInvoicePdf {
+  @Inject()
+  private getSaleInvoicePdfService: SaleInvoicePdf;
+
+  /**
+   * Retrieves the sale invoice PDF of the given payment link id.
+   * @param {number} tenantId
+   * @param {number} paymentLinkId
+   * @returns {Promise<Buffer>}
+   */
+  async getPaymentLinkInvoicePdf(paymentLinkId: string): Promise<Buffer> {
+    const paymentLink = await PaymentLink.query()
+      .findOne('linkId', paymentLinkId)
+      .where('resourceType', 'SaleInvoice')
+      .throwIfNotFound();
+
+    const tenantId = paymentLink.tenantId;
+    await initalizeTenantServices(tenantId);
+
+    const saleInvoiceId = paymentLink.resourceId;
+
+    return this.getSaleInvoicePdfService.saleInvoicePdf(
+      tenantId,
+      saleInvoiceId
+    );
+  }
+}