multiple payout page and small fixes

frontend/pshared/lib/api/responses/login_pending.dart

@@ -10,12 +10,13 @@ part 'login_pending.g.dart';
 class PendingLoginResponse {
   final AccountResponse account;
   final TokenData pendingToken;
-  final String destination;
+  @JsonKey(name: 'destination')
+  final String target;
 
   const PendingLoginResponse({
     required this.account,
     required this.pendingToken,
-    required this.destination,
+    required this.target,
   });
 
   factory PendingLoginResponse.fromJson(Map<String, dynamic> json) => _$PendingLoginResponseFromJson(json);

frontend/pshared/lib/api/responses/payment/payments.dart

@@ -9,6 +9,7 @@ part 'payments.g.dart';
 
 @JsonSerializable(explicitToJson: true)
 class PaymentsResponse extends CursorPageResponse {
+  @JsonKey(defaultValue: <PaymentDTO>[])
   final List<PaymentDTO> payments;
 
   const PaymentsResponse({

frontend/pshared/lib/models/auth/pending_login.dart

@@ -8,7 +8,7 @@ import 'package:pshared/models/session_identifier.dart';
 class PendingLogin {
   final Account account;
   final TokenData pendingToken;
-  final String destination;
+  final String target;
   final SessionIdentifier session;
 
   final int? ttlSeconds;
@@ -19,7 +19,7 @@ class PendingLogin {
   const PendingLogin({
     required this.account,
     required this.pendingToken,
-    required this.destination,
+    required this.target,
     this.ttlSeconds,
     required this.session,
     this.cooldownSeconds,
@@ -33,14 +33,14 @@ class PendingLogin {
   }) => PendingLogin(
     account: response.account.account.toDomain(),
     pendingToken: response.pendingToken,
-    destination: response.destination,
+    target: response.target,
     session: session,
   );
 
   PendingLogin copyWith({
     Account? account,
     TokenData? pendingToken,
-    String? destination,
+    String? target,
     int? ttlSeconds,
     SessionIdentifier? session,
     int? cooldownSeconds,
@@ -51,7 +51,7 @@ class PendingLogin {
     return PendingLogin(
       account: account ?? this.account,
       pendingToken: pendingToken ?? this.pendingToken,
-      destination: destination ?? this.destination,
+      target: target ?? this.target,
       ttlSeconds: ttlSeconds ?? this.cooldownSeconds,
       session: session ?? this.session,
       cooldownSeconds: clearCooldown ? null : cooldownSeconds ?? this.cooldownSeconds,

frontend/pshared/lib/provider/account.dart

@@ -120,12 +120,12 @@ class AccountProvider extends ChangeNotifier {
     VerificationResponse confirmation,
   ) {
     final ttlSeconds = confirmation.ttlSeconds != 0 ? confirmation.ttlSeconds : pending.ttlSeconds;
-    final destination = confirmation.target.isNotEmpty ? confirmation.target : pending.destination;
+    final target = confirmation.target.isNotEmpty ? confirmation.target : pending.target;
     final cooldownSeconds = confirmation.cooldownSeconds;
 
     return pending.copyWith(
       ttlSeconds: ttlSeconds,
-      destination: destination,
+      target: target,
       cooldownSeconds: cooldownSeconds > 0 ? cooldownSeconds : null,
       cooldownUntil: cooldownSeconds > 0 ? DateTime.now().add(confirmation.cooldownDuration) : null,
       clearCooldown: cooldownSeconds <= 0,

frontend/pshared/lib/provider/email_verification.dart

@@ -13,11 +13,21 @@ class EmailVerificationProvider extends ChangeNotifier {
   bool get isLoading => _resource.isLoading;
   bool get isSuccess => _resource.data == true;
   Exception? get error => _resource.error;
-  int? get errorCode => _resource.error is ErrorResponse
-      ? (_resource.error as ErrorResponse).code
-      : null;
-  bool get canResendVerification =>
-      errorCode == 400 || errorCode == 410 || errorCode == 500;
+  ErrorResponse? get errorResponse =>
+      _resource.error is ErrorResponse ? _resource.error as ErrorResponse : null;
+  bool get canResendVerification {
+    final err = errorResponse;
+    if (err == null) return false;
+    switch (err.error) {
+      case 'not_found':
+      case 'token_expired':
+      case 'data_conflict':
+      case 'internal_error':
+        return true;
+      default:
+        return false;
+    }
+  }
 
   Future<void> verify(String token) async {
     final trimmed = token.trim();
@@ -38,10 +48,6 @@ class EmailVerificationProvider extends ChangeNotifier {
       await AccountService.verifyEmail(trimmed);
       _setResource(Resource(data: true, isLoading: false));
     } catch (e) {
-      if (e is ErrorResponse && e.code == 404) {
-        _setResource(Resource(data: true, isLoading: false));
-        return;
-      }
       _setResource(
         Resource(data: null, isLoading: false, error: toException(e)),
       );

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

@@ -12,14 +12,13 @@ class MultiPaymentProvider extends ChangeNotifier {
   late OrganizationsProvider _organization;
   late MultiQuotationProvider _quotation;
 
-  Resource<List<Payment>> _payments = Resource(data: []);
-  bool _isLoaded = false;
+  Resource<List<Payment>> _payments = Resource(data: null);
 
   List<Payment> get payments => _payments.data ?? [];
   bool get isLoading => _payments.isLoading;
   Exception? get error => _payments.error;
   bool get isReady =>
-      _isLoaded && !_payments.isLoading && _payments.error == null;
+      _payments.data != null && !_payments.isLoading && _payments.error == null;
 
   void update(
     OrganizationsProvider organization,
@@ -56,7 +55,6 @@ class MultiPaymentProvider extends ChangeNotifier {
         metadata: metadata,
       );
 
-      _isLoaded = true;
       _setResource(
         _payments.copyWith(data: response, isLoading: false, error: null),
       );
@@ -70,8 +68,7 @@ class MultiPaymentProvider extends ChangeNotifier {
   }
 
   void reset() {
-    _isLoaded = false;
-    _setResource(Resource(data: []));
+    _setResource(Resource(data: null));
   }
 
   void _setResource(Resource<List<Payment>> payments) {

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

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/foundation.dart';
 
 import 'package:uuid/uuid.dart';
@@ -17,11 +19,13 @@ class MultiQuotationProvider extends ChangeNotifier {
   String? _loadedOrganizationRef;
 
   Resource<PaymentQuotes> _quotation = Resource(data: null);
-  bool _isLoaded = false;
 
   List<PaymentIntent>? _lastIntents;
   bool _lastPreviewOnly = false;
   Map<String, String>? _lastMetadata;
+  Timer? _autoRefreshTimer;
+
+  static const Duration _autoRefreshLead = Duration(seconds: 5);
 
   Resource<PaymentQuotes> get resource => _quotation;
   PaymentQuotes? get quotation => _quotation.data;
@@ -29,7 +33,7 @@ class MultiQuotationProvider extends ChangeNotifier {
   Exception? get error => _quotation.error;
   bool get canRefresh => _lastIntents != null && _lastIntents!.isNotEmpty;
   bool get isReady =>
-      _isLoaded && !_quotation.isLoading && _quotation.error == null;
+      quotation != null && !_quotation.isLoading && _quotation.error == null;
 
   DateTime? get quoteExpiresAt {
     final quotes = quotation?.quotes;
@@ -82,6 +86,7 @@ class MultiQuotationProvider extends ChangeNotifier {
         ? null
         : Map<String, String>.from(metadata);
 
+    _cancelAutoRefresh();
     _setResource(_quotation.copyWith(isLoading: true, error: null));
     try {
       final response = await MultiplePaymentsService.getQuotation(
@@ -94,10 +99,10 @@ class MultiQuotationProvider extends ChangeNotifier {
         ),
       );
 
-      _isLoaded = true;
       _setResource(
         _quotation.copyWith(data: response, isLoading: false, error: null),
       );
+      _scheduleAutoRefresh();
     } catch (e) {
       _setResource(
         _quotation.copyWith(
@@ -123,10 +128,10 @@ class MultiQuotationProvider extends ChangeNotifier {
   }
 
   void reset() {
-    _isLoaded = false;
     _lastIntents = null;
     _lastPreviewOnly = false;
     _lastMetadata = null;
+    _cancelAutoRefresh();
     _quotation = Resource(data: null);
     notifyListeners();
   }
@@ -135,4 +140,37 @@ class MultiQuotationProvider extends ChangeNotifier {
     _quotation = quotation;
     notifyListeners();
   }
+
+  void _scheduleAutoRefresh() {
+    _autoRefreshTimer?.cancel();
+    final expiresAt = quoteExpiresAt;
+    if (expiresAt == null) return;
+
+    final now = DateTime.now().toUtc();
+    var delay = expiresAt.difference(now) - _autoRefreshLead;
+    if (delay.isNegative) delay = Duration.zero;
+    _autoRefreshTimer = Timer(delay, _triggerAutoRefresh);
+  }
+
+  Future<void> _triggerAutoRefresh() async {
+    if (_quotation.isLoading) return;
+    final intents = _lastIntents;
+    if (intents == null || intents.isEmpty) return;
+    await quotePayments(
+      intents,
+      previewOnly: _lastPreviewOnly,
+      metadata: _lastMetadata,
+    );
+  }
+
+  void _cancelAutoRefresh() {
+    _autoRefreshTimer?.cancel();
+    _autoRefreshTimer = null;
+  }
+
+  @override
+  void dispose() {
+    _cancelAutoRefresh();
+    super.dispose();
+  }
 }

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

@@ -1,10 +1,7 @@
 import 'package:pshared/controllers/balance_mask/wallets.dart';
 import 'package:pshared/models/payment/asset.dart';
 import 'package:pshared/models/payment/chain_network.dart';
-import 'package:pshared/models/payment/currency_pair.dart';
 import 'package:pshared/models/payment/customer.dart';
-import 'package:pshared/models/payment/fx/intent.dart';
-import 'package:pshared/models/payment/fx/side.dart';
 import 'package:pshared/models/payment/kind.dart';
 import 'package:pshared/models/payment/methods/card.dart';
 import 'package:pshared/models/payment/methods/crypto_address.dart';
@@ -21,6 +18,7 @@ import 'package:pshared/provider/payment/amount.dart';
 import 'package:pshared/provider/payment/flow.dart';
 import 'package:pshared/provider/recipient/provider.dart';
 import 'package:pshared/utils/currency.dart';
+import 'package:pshared/utils/payment/fx_helpers.dart';
 
 
 class QuotationIntentBuilder {
@@ -40,22 +38,19 @@ class QuotationIntentBuilder {
       method: selectedMethod,
       data: paymentData,
     );
+    final sourceCurrency = currencyCodeToString(selectedWallet.currency);
     final amount = Money(
       amount: payment.amount.toString(),
       // TODO: adapt to possible other sources
-      currency: currencyCodeToString(selectedWallet.currency),
+      currency: sourceCurrency,
     );
     final isCryptoToCrypto = paymentData is CryptoAddressPaymentMethod &&
         (paymentData.asset?.tokenSymbol ?? '').trim().toUpperCase() == amount.currency;
-    final fxIntent = isCryptoToCrypto
-        ? null
-        : FxIntent(
-            pair: CurrencyPair(
-              base: currencyCodeToString(selectedWallet.currency),
-              quote: 'RUB', // TODO: exentd target currencies
-            ),
-            side: FxSide.sellBaseBuyQuote,
-          );
+    final fxIntent = FxIntentHelper.buildSellBaseBuyQuote(
+      baseCurrency: sourceCurrency,
+      quoteCurrency: 'RUB', // TODO: exentd target currencies
+      enabled: !isCryptoToCrypto,
+    );
     return PaymentIntent(
       kind: PaymentKind.payout,
       amount: amount,
@@ -69,35 +64,14 @@ class QuotationIntentBuilder {
       ),
       fx: fxIntent,
       settlementMode: payment.payerCoversFee ? SettlementMode.fixReceived : SettlementMode.fixSource,
-      settlementCurrency: _resolveSettlementCurrency(amount: amount, fx: fxIntent),
+      settlementCurrency: FxIntentHelper.resolveSettlementCurrency(
+        amount: amount,
+        fx: fxIntent,
+      ),
       customer: customer,
     );
   }
 
-  String _resolveSettlementCurrency({
-    required Money amount,
-    required FxIntent? fx,
-  }) {
-    final pair = fx?.pair;
-    if (pair != null) {
-      switch (fx?.side ?? FxSide.unspecified) {
-        case FxSide.buyBaseSellQuote:
-          if (pair.base.isNotEmpty) return pair.base;
-          break;
-        case FxSide.sellBaseBuyQuote:
-          if (pair.quote.isNotEmpty) return pair.quote;
-          break;
-        case FxSide.unspecified:
-          break;
-      }
-      if (amount.currency == pair.base && pair.quote.isNotEmpty) return pair.quote;
-      if (amount.currency == pair.quote && pair.base.isNotEmpty) return pair.base;
-      if (pair.quote.isNotEmpty) return pair.quote;
-      if (pair.base.isNotEmpty) return pair.base;
-    }
-    return amount.currency;
-  }
-
   Customer? _buildCustomer({
     required Recipient? recipient,
     required PaymentMethod? method,

frontend/pshared/lib/service/verification.dart

@@ -32,13 +32,13 @@ class VerificationService {
     return VerificationResponse.fromJson(response);
   }
 
-  static Future<VerificationResponse> resendLoginCode(PendingLogin pending, {String? destination}) async {
+  static Future<VerificationResponse> resendLoginCode(PendingLogin pending, {String? target}) async {
     _logger.fine('Resending login confirmation code');
     final response = await getPOSTResponse(
       _objectType,
       '/resend',
       LoginVerificationRequest(
-        target: destination,
+        target: target,
         idempotencyKey: pending.idempotencyKey ?? Uuid().v4(),
       ).toJson(),
       authToken: pending.pendingToken.token,

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

@@ -0,0 +1,47 @@
+import 'package:pshared/models/payment/currency_pair.dart';
+import 'package:pshared/models/payment/fx/intent.dart';
+import 'package:pshared/models/payment/fx/side.dart';
+import 'package:pshared/models/money.dart';
+
+
+class FxIntentHelper {
+  static FxIntent? buildSellBaseBuyQuote({
+    required String baseCurrency,
+    required String quoteCurrency,
+    bool enabled = true,
+  }) {
+    if (!enabled) return null;
+    final base = baseCurrency.trim();
+    final quote = quoteCurrency.trim();
+    if (base.isEmpty || quote.isEmpty) return null;
+    if (base.toUpperCase() == quote.toUpperCase()) return null;
+    return FxIntent(
+      pair: CurrencyPair(base: base, quote: quote),
+      side: FxSide.sellBaseBuyQuote,
+    );
+  }
+
+  static String resolveSettlementCurrency({
+    required Money amount,
+    FxIntent? fx,
+  }) {
+    final pair = fx?.pair;
+    if (pair != null) {
+      switch (fx?.side ?? FxSide.unspecified) {
+        case FxSide.buyBaseSellQuote:
+          if (pair.base.isNotEmpty) return pair.base;
+          break;
+        case FxSide.sellBaseBuyQuote:
+          if (pair.quote.isNotEmpty) return pair.quote;
+          break;
+        case FxSide.unspecified:
+          break;
+      }
+      if (amount.currency == pair.base && pair.quote.isNotEmpty) return pair.quote;
+      if (amount.currency == pair.quote && pair.base.isNotEmpty) return pair.base;
+      if (pair.quote.isNotEmpty) return pair.quote;
+      if (pair.base.isNotEmpty) return pair.base;
+    }
+    return amount.currency;
+  }
+}

frontend/pshared/lib/utils/snackbar.dart

@@ -3,12 +3,17 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 
 
-ScaffoldFeatureController<SnackBar, SnackBarClosedReason> notifyUserX(ScaffoldMessengerState sm, String message, { int delaySeconds = 3 }) 
-{
+ScaffoldFeatureController<SnackBar, SnackBarClosedReason> notifyUserX(
+  ScaffoldMessengerState sm,
+  String message, {
+  int delaySeconds = 3,
+}) {
+  final durationSeconds = _normalizeDelaySeconds(delaySeconds);
+  sm.clearSnackBars();
   return sm.showSnackBar(
     SnackBar(
       content: Text(message),
-      duration: Duration(seconds: delaySeconds),
+      duration: Duration(seconds: durationSeconds),
     ),
   );
 }
@@ -18,8 +23,10 @@ ScaffoldFeatureController<SnackBar, SnackBarClosedReason> notifyUser(BuildContex
 }
 
 Future<ScaffoldFeatureController<SnackBar, SnackBarClosedReason>> postNotifyUser(
-  BuildContext context, String message, {int delaySeconds = 3}) {
-
+  BuildContext context,
+  String message, {
+  int delaySeconds = 3,
+}) {
   final completer = Completer<ScaffoldFeatureController<SnackBar, SnackBarClosedReason>>();
 
   WidgetsBinding.instance.addPostFrameCallback((_) {
@@ -29,3 +36,6 @@ Future<ScaffoldFeatureController<SnackBar, SnackBarClosedReason>> postNotifyUser
 
   return completer.future;
 }
+
+int _normalizeDelaySeconds(int delaySeconds) =>
+    delaySeconds <= 0 ? 3 : delaySeconds;