complete MECE request

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

@@ -12,7 +12,6 @@ import 'package:pshared/provider/resource.dart';
 import 'package:pshared/service/payment/multiple.dart';
 import 'package:pshared/utils/exception.dart';
 
-
 class MultiQuotationProvider extends ChangeNotifier {
   static const Duration _autoRefreshLead = Duration(seconds: 5);
 
@@ -87,10 +86,13 @@ class MultiQuotationProvider extends ChangeNotifier {
 
     _setResource(_quotation.copyWith(isLoading: true, error: null));
     try {
+      final effectiveIdempotencyKey = previewOnly
+          ? ''
+          : (idempotencyKey ?? const Uuid().v4());
       final response = await MultiplePaymentsService.getQuotation(
         organization.current.id,
         QuotePaymentsRequest(
-          idempotencyKey: idempotencyKey ?? const Uuid().v4(),
+          idempotencyKey: effectiveIdempotencyKey,
           metadata: metadata,
           intents: intents.map((intent) => intent.toDTO()).toList(),
           previewOnly: previewOnly,