refactor: ( payment ) use rabbitmq for webhooks event

apps/edr-passenger-api/src/config/rabbitmq.config.ts

@@ -0,0 +1,12 @@
+import { registerAs } from '@nestjs/config';
+
+/**
+ * RabbitMQ connection for the payment-event consumer (payment microservice -> passenger).
+ * Independent of the IAM/notification module's RABBITMQ_URL so the two broker connections
+ * never interfere. Points at the dedicated `payment` vhost on the shared broker.
+ */
+export default registerAs('rabbitmq', () => ({
+  url: process.env.PAYMENT_RABBITMQ_URL ?? 'amqp://localhost:5672/payment',
+  /** Max unacked payment events held by this consumer at once. */
+  prefetch: parseInt(process.env.PAYMENT_EVENTS_PREFETCH ?? '10', 10),
+}));