just send the amount as bigint

mobile-app/lib/services/pos_service.dart

@@ -1,19 +1,11 @@
-import 'package:quantus_sdk/quantus_sdk.dart';
-
 class PosPaymentRequest {
   final String paymentUrl;
   final String refId;
-  final String amount;
 
-  const PosPaymentRequest({required this.paymentUrl, required this.refId, required this.amount});
+  const PosPaymentRequest({required this.paymentUrl, required this.refId});
 }
 
 class PosService {
-  final NumberFormattingService _formattingService;
-
-  PosService({NumberFormattingService? formattingService})
-    : _formattingService = formattingService ?? NumberFormattingService();
-
   String generateRefId() {
     final now = DateTime.now().millisecondsSinceEpoch;
     return now.toRadixString(36).toUpperCase();
@@ -26,8 +18,7 @@ class PosService {
 
   PosPaymentRequest createPaymentRequest({required String accountId, required BigInt amountPlanck}) {
     final refId = generateRefId();
-    final wireAmount = _formattingService.formatWireAmount(amountPlanck);
-    final url = buildPaymentUrl(accountId: accountId, amount: wireAmount, refId: refId);
-    return PosPaymentRequest(paymentUrl: url, refId: refId, amount: wireAmount);
+    final url = buildPaymentUrl(accountId: accountId, amount: amountPlanck.toString(), refId: refId);
+    return PosPaymentRequest(paymentUrl: url, refId: refId);
   }
 }

mobile-app/lib/v2/screens/pos/pos_qr_screen.dart

@@ -159,7 +159,6 @@ class _PosQrScreenState extends ConsumerState<PosQrScreen> {
     final colors = context.colors;
     final text = context.themeText;
     final accountAsync = ref.watch(activeAccountProvider);
-    final formattingService = ref.watch(numberFormattingServiceProvider);
     final display = ref.watch(txAmountDisplayProvider)(
       widget.amountPlanck,
       withSignPrefix: false,
@@ -176,9 +175,10 @@ class _PosQrScreenState extends ConsumerState<PosQrScreen> {
         ),
         data: (active) {
           if (active == null) return const Center(child: Text('No active account'));
-          _request ??= PosService(
-            formattingService: formattingService,
-          ).createPaymentRequest(accountId: active.account.accountId, amountPlanck: widget.amountPlanck);
+          _request ??= PosService().createPaymentRequest(
+            accountId: active.account.accountId,
+            amountPlanck: widget.amountPlanck,
+          );
           if (_isPaid) return _buildPaidContent(colors, text, display.primaryAmount);
           return _buildQrContent(_request!, colors, text, display);
         },

mobile-app/lib/v2/screens/send/input_amount_screen.dart

@@ -66,9 +66,8 @@ class _InputAmountScreenState extends ConsumerState<InputAmountScreen> {
     assert(widget.recipientAddress.trim().isNotEmpty, 'InputAmountScreen requires a recipient');
     _amountFocus.addListener(_onAmountFocusChanged);
     if (widget.initialAmount != null && widget.initialAmount!.isNotEmpty) {
-      final formattingService = ref.read(numberFormattingServiceProvider);
       final planck = widget.isPayMode
-          ? formattingService.parseWireAmount(widget.initialAmount!) ?? BigInt.zero
+          ? BigInt.tryParse(widget.initialAmount!) ?? BigInt.zero
           : _amountInputLogic.parseQuanAmount(widget.initialAmount!);
       if (planck > BigInt.zero) {
         _amount = planck;

mobile-app/test/unit/number_formatting_service_test.dart

@@ -90,40 +90,5 @@ void main() {
       });
     });
 
-    group('formatWireAmount / parseWireAmount', () {
-      test('formatWireAmount always uses dot decimal without grouping', () {
-        final commaService = NumberFormattingService(localeConfig: LocaleNumberConfig.commaDecimal);
-        final balance = BigInt.parse('1500000000000');
-        expect(commaService.formatWireAmount(balance), '1.5');
-      });
-
-      test('round-trips canonical wire amounts', () {
-        final balance = BigInt.parse('1500000000000');
-        final wire = service.formatWireAmount(balance);
-        expect(wire, '1.5');
-        expect(service.parseWireAmount(wire), balance);
-      });
-
-      test('parses legacy comma-decimal amounts', () {
-        expect(service.parseWireAmount('1,5'), BigInt.parse('1500000000000'));
-      });
-
-      test('parses legacy dot-decimal amounts', () {
-        expect(service.parseWireAmount('1.5'), BigInt.parse('1500000000000'));
-      });
-
-      test('parses integer amounts', () {
-        expect(service.parseWireAmount('1000'), scaleFactor * BigInt.from(1000));
-      });
-
-      test('parses mixed separators using rightmost decimal mark', () {
-        expect(service.parseWireAmount('1.000,50'), BigInt.parse('1000500000000000'));
-        expect(service.parseWireAmount('1,000.50'), BigInt.parse('1000500000000000'));
-      });
-
-      test('returns zero for empty wire amount', () {
-        expect(service.parseWireAmount(''), BigInt.zero);
-      });
-    });
   });
 }

mobile-app/test/unit/pos_service_test.dart

@@ -1,19 +1,15 @@
 import 'package:flutter_test/flutter_test.dart';
-import 'package:quantus_sdk/quantus_sdk.dart';
 import 'package:resonance_network_wallet/services/pos_service.dart';
 
 void main() {
   group('PosService', () {
-    test('createPaymentRequest embeds canonical dot-decimal wire amount', () {
-      final formattingService = NumberFormattingService(localeConfig: LocaleNumberConfig.commaDecimal);
-      final service = PosService(formattingService: formattingService);
+    test('createPaymentRequest embeds raw planck integer amount', () {
+      final service = PosService();
       final amountPlanck = BigInt.parse('1500000000000');
 
       final request = service.createPaymentRequest(accountId: 'account123', amountPlanck: amountPlanck);
 
-      expect(request.amount, '1.5');
-      expect(request.paymentUrl, contains('amount=1.5'));
-      expect(request.paymentUrl, isNot(contains('amount=1%2C5')));
+      expect(request.paymentUrl, contains('amount=1500000000000'));
       expect(request.paymentUrl, contains('to=account123'));
       expect(request.refId, isNotEmpty);
     });

quantus_sdk/lib/src/services/number_formatting_service.dart

@@ -58,43 +58,6 @@ class NumberFormattingService {
     return resultString;
   }
 
-  /// Formats a balance for payment URL wire transport: dot decimal, no grouping.
-  ///
-  /// Wire amounts are locale-neutral and must be parsed with [parseWireAmount].
-  String formatWireAmount(BigInt balance) {
-    return NumberFormattingService(
-      localeConfig: LocaleNumberConfig.dotDecimal,
-    ).formatBalance(balance, maxDecimals: decimals, addThousandsSeparators: false);
-  }
-
-  /// Parses a payment URL amount without assuming the payer's locale.
-  ///
-  /// Supports canonical dot-decimal wire amounts and legacy locale-formatted
-  /// amounts from older POS QR codes.
-  BigInt? parseWireAmount(String formattedAmount) {
-    if (formattedAmount.isEmpty) {
-      return BigInt.zero;
-    }
-
-    final config = _wireLocaleConfigFor(formattedAmount);
-    return NumberFormattingService(localeConfig: config).parseAmount(formattedAmount);
-  }
-
-  static LocaleNumberConfig _wireLocaleConfigFor(String input) {
-    final hasComma = input.contains(',');
-    final hasDot = input.contains('.');
-
-    if (hasComma && hasDot) {
-      final lastComma = input.lastIndexOf(',');
-      final lastDot = input.lastIndexOf('.');
-      return lastComma > lastDot ? LocaleNumberConfig.commaDecimal : LocaleNumberConfig.dotDecimal;
-    }
-    if (hasComma) {
-      return LocaleNumberConfig.commaDecimal;
-    }
-    return LocaleNumberConfig.dotDecimal;
-  }
-
   /// Parses a user-entered formatted string amount into a raw BigInt amount
   /// scaled by the chain's decimals.
   ///