fix: reference type in payment and billing

apps/edr-freight-api/src/modules/billing/billing.service.ts

@@ -1,6 +1,6 @@
 import { forwardRef, Inject, Injectable, Logger, NotFoundException } from "@nestjs/common";
 import { EventEmitter2 } from "@nestjs/event-emitter";
-import { Freight } from "@edr/types";
+import { Freight, PaymentReferenceType } from "@edr/types";
 import { DataSource, EntityManager, In } from "typeorm";
 
 import { Invoice } from "./entities/invoice.entity";
@@ -417,6 +417,12 @@ export class BillingService {
 
     const result = await this.payment.initiate({
       referenceId: sourceId,
+      source: invoice.source,
+      // Gateway reference type derives from the invoice source by convention
+      // (source.toUpperCase() ∈ PaymentReferenceType) — no domain word here, and
+      // the domain never supplies it. New sources add their uppercased value to
+      // the PaymentReferenceType enum.
+      referenceType: invoice.source.toUpperCase() as PaymentReferenceType,
       orderRef: invoice.invoiceNumber,
       amountMinor: Math.round(Number(invoice.totalAmount)),
       currency: invoice.currency,