intent reference generation + propagation

frontend/pshared/lib/provider/payment/multiple/provider.dart

@@ -7,7 +7,6 @@ import 'package:pshared/provider/resource.dart';
 import 'package:pshared/service/payment/multiple.dart';
 import 'package:pshared/utils/exception.dart';
 
-
 class MultiPaymentProvider extends ChangeNotifier {
   late OrganizationsProvider _organization;
   late MultiQuotationProvider _quotation;
@@ -31,6 +30,8 @@ class MultiPaymentProvider extends ChangeNotifier {
   Future<List<Payment>> pay({
     String? idempotencyKey,
     Map<String, String>? metadata,
+    String? intentRef,
+    List<String>? intentRefs,
   }) async {
     if (!_organization.isOrganizationSet) {
       throw StateError('Organization is not set');
@@ -53,6 +54,8 @@ class MultiPaymentProvider extends ChangeNotifier {
         quoteRef,
         idempotencyKey: idempotencyKey,
         metadata: metadata,
+        intentRef: intentRef,
+        intentRefs: intentRefs,
       );
 
       _setResource(