small fixes for single payout and big chunck for multiple payouts

frontend/pshared/lib/data/dto/payment/payment.dart

@@ -13,6 +13,8 @@ class PaymentDTO {
   final String? failureCode;
   final String? failureReason;
   final PaymentQuoteDTO? lastQuote;
+  final Map<String, String>? metadata;
+  final String? createdAt;
 
   const PaymentDTO({
     this.paymentRef,
@@ -21,6 +23,8 @@ class PaymentDTO {
     this.failureCode,
     this.failureReason,
     this.lastQuote,
+    this.metadata,
+    this.createdAt,
   });
 
   factory PaymentDTO.fromJson(Map<String, dynamic> json) => _$PaymentDTOFromJson(json);

frontend/pshared/lib/data/dto/payment/quotes.dart

@@ -5,19 +5,21 @@ import 'package:pshared/data/dto/payment/payment_quote.dart';
 
 part 'quotes.g.dart';
 
-
 @JsonSerializable()
 class PaymentQuotesDTO {
   final String quoteRef;
+  final String? idempotencyKey;
   final PaymentQuoteAggregateDTO? aggregate;
   final List<PaymentQuoteDTO>? quotes;
 
   const PaymentQuotesDTO({
     required this.quoteRef,
+    this.idempotencyKey,
     this.aggregate,
     this.quotes,
   });
 
-  factory PaymentQuotesDTO.fromJson(Map<String, dynamic> json) => _$PaymentQuotesDTOFromJson(json);
+  factory PaymentQuotesDTO.fromJson(Map<String, dynamic> json) =>
+      _$PaymentQuotesDTOFromJson(json);
   Map<String, dynamic> toJson() => _$PaymentQuotesDTOToJson(this);
 }

frontend/pshared/lib/data/mapper/payment/payment_response.dart

@@ -11,6 +11,8 @@ extension PaymentDTOMapper on PaymentDTO {
         failureCode: failureCode,
         failureReason: failureReason,
         lastQuote: lastQuote?.toDomain(),
+        metadata: metadata,
+        createdAt: createdAt == null ? null : DateTime.tryParse(createdAt!),
       );
 }
 
@@ -22,5 +24,7 @@ extension PaymentMapper on Payment {
         failureCode: failureCode,
         failureReason: failureReason,
         lastQuote: lastQuote?.toDTO(),
+        metadata: metadata,
+        createdAt: createdAt?.toUtc().toIso8601String(),
       );
 }

frontend/pshared/lib/data/mapper/payment/quote/quotes.dart

@@ -3,11 +3,10 @@ import 'package:pshared/data/mapper/payment/payment_quote.dart';
 import 'package:pshared/data/mapper/payment/quote/aggregate.dart';
 import 'package:pshared/models/payment/quote/quotes.dart';
 
-
 extension PaymentQuotesDTOMapper on PaymentQuotesDTO {
   PaymentQuotes toDomain({String? idempotencyKey}) => PaymentQuotes(
     quoteRef: quoteRef,
-    idempotencyKey: idempotencyKey,
+    idempotencyKey: idempotencyKey ?? this.idempotencyKey,
     aggregate: aggregate?.toDomain(),
     quotes: quotes?.map((quote) => quote.toDomain()).toList(),
   );
@@ -16,6 +15,7 @@ extension PaymentQuotesDTOMapper on PaymentQuotesDTO {
 extension PaymentQuotesMapper on PaymentQuotes {
   PaymentQuotesDTO toDTO() => PaymentQuotesDTO(
     quoteRef: quoteRef,
+    idempotencyKey: idempotencyKey,
     aggregate: aggregate?.toDTO(),
     quotes: quotes?.map((quote) => quote.toDTO()).toList(),
   );