complete MECE request

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

@@ -4,7 +4,6 @@ import 'package:pshared/data/dto/money.dart';
 
 part 'fx_quote.g.dart';
 
-
 @JsonSerializable()
 class FxQuoteDTO {
   final String? quoteRef;
@@ -15,6 +14,7 @@ class FxQuoteDTO {
   final MoneyDTO? baseAmount;
   final MoneyDTO? quoteAmount;
   final int? expiresAtUnixMs;
+  final int? pricedAtUnixMs;
   final String? provider;
   final String? rateRef;
 
@@ -30,11 +30,13 @@ class FxQuoteDTO {
     this.baseAmount,
     this.quoteAmount,
     this.expiresAtUnixMs,
+    this.pricedAtUnixMs,
     this.provider,
     this.rateRef,
     this.firm = false,
   });
 
-  factory FxQuoteDTO.fromJson(Map<String, dynamic> json) => _$FxQuoteDTOFromJson(json);
+  factory FxQuoteDTO.fromJson(Map<String, dynamic> json) =>
+      _$FxQuoteDTOFromJson(json);
   Map<String, dynamic> toJson() => _$FxQuoteDTOToJson(this);
 }

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

@@ -2,35 +2,36 @@ import 'package:pshared/data/dto/payment/fx_quote.dart';
 import 'package:pshared/data/mapper/money.dart';
 import 'package:pshared/models/payment/fx/quote.dart';
 
-
 extension FxQuoteDTOMapper on FxQuoteDTO {
   FxQuote toDomain() => FxQuote(
-        quoteRef: quoteRef,
-        baseCurrency: baseCurrency,
-        quoteCurrency: quoteCurrency,
-        side: side,
-        price: price,
-        baseAmount: baseAmount?.toDomain(),
-        quoteAmount: quoteAmount?.toDomain(),
-        expiresAtUnixMs: expiresAtUnixMs,
-        provider: provider,
-        rateRef: rateRef,
-        firm: firm ?? false,
-      );
+    quoteRef: quoteRef,
+    baseCurrency: baseCurrency,
+    quoteCurrency: quoteCurrency,
+    side: side,
+    price: price,
+    baseAmount: baseAmount?.toDomain(),
+    quoteAmount: quoteAmount?.toDomain(),
+    expiresAtUnixMs: expiresAtUnixMs,
+    pricedAtUnixMs: pricedAtUnixMs,
+    provider: provider,
+    rateRef: rateRef,
+    firm: firm ?? false,
+  );
 }
 
 extension FxQuoteMapper on FxQuote {
   FxQuoteDTO toDTO() => FxQuoteDTO(
-        quoteRef: quoteRef,
-        baseCurrency: baseCurrency,
-        quoteCurrency: quoteCurrency,
-        side: side,
-        price: price,
-        baseAmount: baseAmount?.toDTO(),
-        quoteAmount: quoteAmount?.toDTO(),
-        expiresAtUnixMs: expiresAtUnixMs,
-        provider: provider,
-        rateRef: rateRef,
-        firm: firm,
-      );
+    quoteRef: quoteRef,
+    baseCurrency: baseCurrency,
+    quoteCurrency: quoteCurrency,
+    side: side,
+    price: price,
+    baseAmount: baseAmount?.toDTO(),
+    quoteAmount: quoteAmount?.toDTO(),
+    expiresAtUnixMs: expiresAtUnixMs,
+    pricedAtUnixMs: pricedAtUnixMs,
+    provider: provider,
+    rateRef: rateRef,
+    firm: firm,
+  );
 }

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

@@ -1,5 +1,5 @@
 import 'package:pshared/data/dto/payment/payment.dart';
-import 'package:pshared/data/mapper/payment/payment_quote.dart';
+import 'package:pshared/data/mapper/payment/quote.dart';
 import 'package:pshared/models/payment/payment.dart';
 import 'package:pshared/models/payment/state.dart';
 

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

@@ -1,5 +1,5 @@
 import 'package:pshared/data/dto/payment/payment_quote.dart';
-import 'package:pshared/data/mapper/payment/fee_line.dart';
+import 'package:pshared/data/mapper/payment/fees/line.dart';
 import 'package:pshared/data/mapper/payment/fx_quote.dart';
 import 'package:pshared/data/mapper/money.dart';
 import 'package:pshared/data/mapper/payment/network_fee.dart';

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

@@ -1,5 +1,5 @@
 import 'package:pshared/data/dto/payment/quotes.dart';
-import 'package:pshared/data/mapper/payment/payment_quote.dart';
+import 'package:pshared/data/mapper/payment/quote.dart';
 import 'package:pshared/data/mapper/payment/quote/aggregate.dart';
 import 'package:pshared/models/payment/quote/quotes.dart';
 

frontend/pshared/lib/models/payment/fx/quote.dart

@@ -1,6 +1,5 @@
 import 'package:pshared/models/money.dart';
 
-
 class FxQuote {
   final String? quoteRef;
   final String? baseCurrency;
@@ -10,6 +9,7 @@ class FxQuote {
   final Money? baseAmount;
   final Money? quoteAmount;
   final int? expiresAtUnixMs;
+  final int? pricedAtUnixMs;
   final String? provider;
   final String? rateRef;
   final bool firm;
@@ -23,6 +23,7 @@ class FxQuote {
     required this.baseAmount,
     required this.quoteAmount,
     required this.expiresAtUnixMs,
+    required this.pricedAtUnixMs,
     required this.provider,
     required this.rateRef,
     this.firm = false,

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,

frontend/pshared/lib/service/payment/quotation.dart

@@ -4,7 +4,7 @@ import 'package:pshared/api/requests/payment/quote.dart';
 import 'package:pshared/api/requests/payment/quotes.dart';
 import 'package:pshared/api/responses/payment/quotation.dart';
 import 'package:pshared/api/responses/payment/quotes.dart';
-import 'package:pshared/data/mapper/payment/payment_quote.dart';
+import 'package:pshared/data/mapper/payment/quote.dart';
 import 'package:pshared/data/mapper/payment/quote/quotes.dart';
 import 'package:pshared/models/payment/quote/quote.dart';
 import 'package:pshared/models/payment/quote/quotes.dart';

frontend/pshared/test/payment/request_dto_format_test.dart

@@ -5,6 +5,7 @@ import 'package:test/test.dart';
 import 'package:pshared/api/requests/payment/initiate.dart';
 import 'package:pshared/api/requests/payment/initiate_payments.dart';
 import 'package:pshared/api/requests/payment/quote.dart';
+import 'package:pshared/api/responses/payment/quotation.dart';
 import 'package:pshared/data/dto/money.dart';
 import 'package:pshared/data/dto/payment/endpoint.dart';
 import 'package:pshared/data/dto/payment/intent/payment.dart';
@@ -40,7 +41,7 @@ void main() {
 
     test('quote payment request uses expected backend field names', () {
       final request = QuotePaymentRequest(
-        idempotencyKey: 'idem-1',
+        idempotencyKey: '',
         previewOnly: true,
         intent: const PaymentIntentDTO(
           kind: 'payout',
@@ -60,7 +61,7 @@ void main() {
       final json =
           jsonDecode(jsonEncode(request.toJson())) as Map<String, dynamic>;
 
-      expect(json['idempotencyKey'], equals('idem-1'));
+      expect(json['idempotencyKey'], equals(''));
       expect(json['previewOnly'], isTrue);
       expect(json['intent'], isA<Map<String, dynamic>>());
 
@@ -75,6 +76,34 @@ void main() {
       expect(destination['type'], equals('cardToken'));
     });
 
+    test('quote response parses backend fx quote pricedAtUnixMs', () {
+      final response = PaymentQuoteResponse.fromJson({
+        'accessToken': {'token': 'token', 'expiration': '2026-02-25T00:00:00Z'},
+        'idempotencyKey': 'idem-1',
+        'quote': {
+          'quoteRef': 'q-1',
+          'debitAmount': {'amount': '10', 'currency': 'USDT'},
+          'expectedSettlementAmount': {'amount': '760', 'currency': 'RUB'},
+          'fxQuote': {
+            'quoteRef': 'fx-1',
+            'baseCurrency': 'USDT',
+            'quoteCurrency': 'RUB',
+            'side': 'sell_base_buy_quote',
+            'price': '76',
+            'baseAmount': {'amount': '10', 'currency': 'USDT'},
+            'quoteAmount': {'amount': '760', 'currency': 'RUB'},
+            'expiresAtUnixMs': 1771945907749,
+            'pricedAtUnixMs': 1771945907000,
+            'provider': 'binance',
+            'rateRef': 'rate-1',
+            'firm': false,
+          },
+        },
+      });
+
+      expect(response.quote.fxQuote?.pricedAtUnixMs, equals(1771945907000));
+    });
+
     test('initiate payment by quote keeps expected fields', () {
       final request = InitiatePaymentRequest(
         idempotencyKey: 'idem-2',