feat: implement audit logs

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

@@ -10,6 +10,7 @@ import {
 import { EventEmitter2 } from "@nestjs/event-emitter";
 import { DataSource, EntityManager, In } from "typeorm";
 
+import { Booking } from "../bookings/entities/booking.entity";
 import { CompaniesService } from "../companies/companies.service";
 import { applyBookingRefDirectionScope } from "../user-trade-access/trade-scope.util";
 import { PaymentService } from "../payment/payment.service";
@@ -1192,6 +1193,17 @@ export class BillingService {
       .getRepository(Invoice)
       .update({ id: invoice.id }, { paymentId: result.intentId });
 
+    // CBE_BILL: the bill reference IS the booking's PNR — the number the customer pays against
+    // at any CBE channel. Persist it on the booking so it survives the initiate response and
+    // shows on the booking/contract everywhere. The payment service reissues the same reference
+    // while the bill stays open, so re-initiating overwrites with an identical value.
+    const billReference = result.response.clientAction?.billReference;
+    if (billReference && invoice.source === Freight.InvoiceSource.Booking) {
+      await this.dataSource
+        .getRepository(Booking)
+        .update({ id: invoice.sourceId }, { pnrCode: billReference });
+    }
+
     // Settlement is driven by the payment API (webhook/outbox → payment.succeeded);
     // billing must not simulate it. Kept for local demos only.
     // An OTP intent (CAC Bank) is NOT paid yet — the payer still has to enter the