changed color theme to be black and added the ability to enter the amount in the recipient’s currency

frontend/pshared/lib/config/common.dart

@@ -15,7 +15,7 @@ class CommonConstants {
   static String clientId = '';
   static String wsProto = 'ws';
   static String wsEndpoint = '/ws';
-  static Color themeColor = Color.fromARGB(255, 80, 63, 224);
+  static Color themeColor = Color.fromARGB(255, 0, 0, 0);
   static String nilObjectRef = '000000000000000000000000';
 
   // Public getters for shared properties

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

@@ -0,0 +1,20 @@
+import 'package:json_annotation/json_annotation.dart';
+
+import 'package:pshared/data/dto/money.dart';
+
+part 'network_fee.g.dart';
+
+
+@JsonSerializable()
+class NetworkFeeDTO {
+  final MoneyDTO? networkFee;
+  final String? estimationContext;
+
+  const NetworkFeeDTO({
+    this.networkFee,
+    this.estimationContext,
+  });
+
+  factory NetworkFeeDTO.fromJson(Map<String, dynamic> json) => _$NetworkFeeDTOFromJson(json);
+  Map<String, dynamic> toJson() => _$NetworkFeeDTOToJson(this);
+}

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

@@ -0,0 +1,24 @@
+import 'package:json_annotation/json_annotation.dart';
+
+import 'package:pshared/data/dto/money.dart';
+
+part 'quote_aggregate.g.dart';
+
+
+@JsonSerializable()
+class PaymentQuoteAggregateDTO {
+  final List<MoneyDTO>? debitAmounts;
+  final List<MoneyDTO>? expectedSettlementAmounts;
+  final List<MoneyDTO>? expectedFeeTotals;
+  final List<MoneyDTO>? networkFeeTotals;
+
+  const PaymentQuoteAggregateDTO({
+    this.debitAmounts,
+    this.expectedSettlementAmounts,
+    this.expectedFeeTotals,
+    this.networkFeeTotals,
+  });
+
+  factory PaymentQuoteAggregateDTO.fromJson(Map<String, dynamic> json) => _$PaymentQuoteAggregateDTOFromJson(json);
+  Map<String, dynamic> toJson() => _$PaymentQuoteAggregateDTOToJson(this);
+}

frontend/pshared/lib/models/resources.dart

@@ -73,7 +73,7 @@ enum ResourceType {
   @JsonValue('ledger_parties')
   ledgerParties,
 
-  @JsonValue('ledger_posing_lines')
+  @JsonValue('ledger_posting_lines')
   ledgerPostingLines,
 
   @JsonValue('payments')
@@ -113,4 +113,8 @@ enum ResourceType {
   /// Represents steps in workflows or processes
   @JsonValue('steps')
   steps,
+
+  /// Fallback for unknown values returned by backend.
+  @JsonValue('unknown')
+  unknown,
 }

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

@@ -1,12 +1,15 @@
 import 'package:flutter/material.dart';
 
+import 'package:pshared/models/payment/settlement_mode.dart';
 
 class PaymentAmountProvider with ChangeNotifier {
   double _amount = 10.0;
   bool _payerCoversFee = true;
+  SettlementMode _settlementMode = SettlementMode.fixSource;
 
   double get amount => _amount;
   bool get payerCoversFee => _payerCoversFee;
+  SettlementMode get settlementMode => _settlementMode;
 
   void setAmount(double value) {
     _amount = value;
@@ -17,4 +20,10 @@ class PaymentAmountProvider with ChangeNotifier {
     _payerCoversFee = value;
     notifyListeners();
   }
+
+  void setSettlementMode(SettlementMode value) {
+    if (_settlementMode == value) return;
+    _settlementMode = value;
+    notifyListeners();
+  }
 }

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

@@ -7,6 +7,7 @@ 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;

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

@@ -22,6 +22,8 @@ import 'package:pshared/utils/currency.dart';
 import 'package:pshared/utils/payment/fx_helpers.dart';
 
 class QuotationIntentBuilder {
+  static const String _settlementCurrency = 'RUB';
+
   PaymentIntent? build({
     required PaymentAmountProvider payment,
     required WalletsController wallets,
@@ -39,10 +41,12 @@ class QuotationIntentBuilder {
       data: paymentData,
     );
     final sourceCurrency = currencyCodeToString(selectedWallet.currency);
+    final amountCurrency = payment.settlementMode == SettlementMode.fixReceived
+        ? _settlementCurrency
+        : sourceCurrency;
     final amount = Money(
       amount: payment.amount.toString(),
-      // TODO: adapt to possible other sources
-      currency: sourceCurrency,
+      currency: amountCurrency,
     );
     final isCryptoToCrypto =
         paymentData is CryptoAddressPaymentMethod &&
@@ -50,7 +54,7 @@ class QuotationIntentBuilder {
             amount.currency;
     final fxIntent = FxIntentHelper.buildSellBaseBuyQuote(
       baseCurrency: sourceCurrency,
-      quoteCurrency: 'RUB', // TODO: exentd target currencies
+      quoteCurrency: _settlementCurrency, // TODO: exentd target currencies
       enabled: !isCryptoToCrypto,
     );
     return PaymentIntent(
@@ -68,7 +72,7 @@ class QuotationIntentBuilder {
       feeTreatment: payment.payerCoversFee
           ? FeeTreatment.addToSource
           : FeeTreatment.deductFromDestination,
-      settlementMode: SettlementMode.fixSource,
+      settlementMode: payment.settlementMode,
       customer: customer,
     );
   }

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

@@ -13,6 +13,7 @@ import 'package:pshared/models/payment/quote/quotes.dart';
 import 'package:pshared/service/authorization/service.dart';
 import 'package:pshared/service/services.dart';
 
+
 class MultiplePaymentsService {
   static final _logger = Logger('service.payment.multiple');
   static const String _objectType = Services.payments;

frontend/pshared/lib/service/verification.dart

@@ -17,6 +17,7 @@ import 'package:pshared/service/authorization/storage.dart';
 import 'package:pshared/service/services.dart';
 import 'package:pshared/utils/http/requests.dart';
 
+
 class VerificationService {
   static final _logger = Logger('service.verification');
   static const String _objectType = Services.verification;

frontend/pshared/lib/utils/payment/quotation_currency_resolver.dart

@@ -0,0 +1,57 @@
+import 'package:pshared/models/payment/methods/card.dart';
+import 'package:pshared/models/payment/methods/crypto_address.dart';
+import 'package:pshared/models/payment/methods/data.dart';
+import 'package:pshared/models/payment/methods/iban.dart';
+import 'package:pshared/models/payment/methods/russian_bank.dart';
+import 'package:pshared/models/payment/quote/quote.dart';
+
+
+class PaymentQuotationCurrencyResolver {
+  static String? resolveQuoteCurrency({
+    PaymentQuote? quote,
+    PaymentMethodData? paymentData,
+  }) {
+    final quoteCurrency = _normalizeCurrency(
+      quote?.amounts?.destinationSettlement?.currency,
+    );
+    if (quoteCurrency != null) return quoteCurrency;
+
+    if (paymentData == null) return null;
+
+    final metadataCurrency = _normalizeCurrency(
+      paymentData.metadata?['currency'],
+    );
+    if (metadataCurrency != null) return metadataCurrency;
+
+    if (paymentData is CryptoAddressPaymentMethod) {
+      return _normalizeCurrency(paymentData.asset?.tokenSymbol);
+    }
+
+    if (paymentData is RussianBankAccountPaymentMethod ||
+        paymentData is CardPaymentMethod) {
+      return 'RUB';
+    }
+
+    if (paymentData is IbanPaymentMethod) {
+      return 'EUR';
+    }
+
+    return null;
+  }
+
+  static bool isFxEnabled({
+    required String? sourceCurrency,
+    required String? quoteCurrency,
+  }) {
+    final normalizedSource = _normalizeCurrency(sourceCurrency);
+    final normalizedQuote = _normalizeCurrency(quoteCurrency);
+    if (normalizedSource == null || normalizedQuote == null) return false;
+    return normalizedSource != normalizedQuote;
+  }
+
+  static String? _normalizeCurrency(String? value) {
+    final normalized = value?.trim().toUpperCase();
+    if (normalized == null || normalized.isEmpty) return null;
+    return normalized;
+  }
+}