serialize external amounts with locale-independent decimals and use standard monero family query parameters

diff --git a/lib/pages/receive_view/generate_receiving_uri_qr_code_view.dart b/lib/pages/receive_view/generate_receiving_uri_qr_code_view.dart
index adeb67c..0c5e3d7 100644
--- a/lib/pages/receive_view/generate_receiving_uri_qr_code_view.dart
+++ b/lib/pages/receive_view/generate_receiving_uri_qr_code_view.dart
@@ -27,6 +27,8 @@ import '../../providers/global/locale_provider.dart';
 import '../../themes/stack_colors.dart';
 import '../../utilities/address_utils.dart';
 import '../../utilities/amount/amount.dart';
+import '../../utilities/amount/amount_field_relocalization.dart';
+import '../../utilities/amount/amount_input_formatter.dart';
 import '../../utilities/assets.dart';
 import '../../utilities/clipboard_interface.dart';
 import '../../utilities/constants.dart';
@@ -157,7 +159,11 @@ class _GenerateUriQrCodeViewState extends ConsumerState<GenerateUriQrCodeView> {
     final noteString = noteController.text;
 
     final locale = ref.read(localeServiceChangeNotifierProvider).locale;
-    final amount = Amount.tryParseLocalizedNumber(amountString, locale: locale);
+    final amount = Amount.tryParseEditableAmount(
+      amountString,
+      locale: locale,
+      fractionDigits: widget.coin.fractionDigits,
+    );
 
     if (amountString.isNotEmpty && amount == null) {
       showFloatingFlushBar(
@@ -168,15 +174,6 @@ class _GenerateUriQrCodeViewState extends ConsumerState<GenerateUriQrCodeView> {
       return null;
     }
 
-    final Map<String, String> queryParams = {};
-
-    if (amountString.isNotEmpty) {
-      queryParams["amount"] = amount.toString();
-    }
-    if (noteString.isNotEmpty) {
-      queryParams["message"] = noteString;
-    }
-
     String receivingAddress = widget.receivingAddress;
     if ((widget.coin is Bitcoincash || widget.coin is Ecash) &&
         receivingAddress.contains(":")) {
@@ -184,10 +181,11 @@ class _GenerateUriQrCodeViewState extends ConsumerState<GenerateUriQrCodeView> {
       receivingAddress = receivingAddress.split(":").sublist(1).join();
     }
 
-    final uriString = AddressUtils.buildUriString(
-      widget.coin.uriScheme,
-      receivingAddress,
-      queryParams,
+    final uriString = AddressUtils.buildPaymentUriString(
+      scheme: widget.coin.uriScheme,
+      address: receivingAddress,
+      amount: amount?.decimal.toString(),
+      message: noteString,
     );
 
     Logging.instance.d("Generated receiving QR code for: $uriString");
@@ -295,6 +293,8 @@ class _GenerateUriQrCodeViewState extends ConsumerState<GenerateUriQrCodeView> {
   Widget build(BuildContext context) {
     debugPrint("BUILD: $runtimeType");
 
+    listenForAmountRelocalization(ref.listen, controllers: [amountController]);
+
     return ConditionalParent(
       condition: !isDesktop,
       builder: (child) => Background(
@@ -391,6 +391,17 @@ class _GenerateUriQrCodeViewState extends ConsumerState<GenerateUriQrCodeView> {
                 keyboardType: Util.isDesktop
                     ? null
                     : const TextInputType.numberWithOptions(decimal: true),
+                inputFormatters: [
+                  AmountInputFormatter(
+                    controller: amountController,
+                    decimals: widget.coin.fractionDigits,
+                    locale: ref.watch(
+                      localeServiceChangeNotifierProvider.select(
+                        (value) => value.locale,
+                      ),
+                    ),
+                  ),
+                ],
                 onChanged: (_) => setState(() {}),
                 decoration:
                     standardInputDecoration(
diff --git a/lib/pages/shopinbit/shopinbit_payment_shared.dart b/lib/pages/shopinbit/shopinbit_payment_shared.dart
index c5b4156..4552e56 100644
--- a/lib/pages/shopinbit/shopinbit_payment_shared.dart
+++ b/lib/pages/shopinbit/shopinbit_payment_shared.dart
@@ -1,4 +1,3 @@
-import 'package:decimal/decimal.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
@@ -74,16 +73,14 @@ ShopInBitPaymentTarget parseShopInBitPaymentTarget({
 
   Amount? amount;
   if (amountStr != null && amountStr.isNotEmpty) {
-    try {
-      amount = Amount.fromDecimal(
-        Decimal.parse(amountStr),
-        fractionDigits: fractionDigits,
-      );
-    } catch (e, s) {
+    amount = Amount.tryParseCanonicalAmount(
+      amountStr,
+      fractionDigits: fractionDigits,
+      truncateOverprecision: true,
+    );
+    if (amount == null) {
       Logging.instance.e(
         "Failed to parse ShopInBit payment amount '$amountStr'",
-        error: e,
-        stackTrace: s,
       );
     }
   }
diff --git a/lib/utilities/address_utils.dart b/lib/utilities/address_utils.dart
index acd6c1e..cb57e48 100644
--- a/lib/utilities/address_utils.dart
+++ b/lib/utilities/address_utils.dart
@@ -193,27 +193,32 @@ class AddressUtils {
       uriString = "$scheme:$address";
     }
 
-    if (scheme.toLowerCase() == "monero") {
-      // Handle Monero-specific formatting.
-      if (filteredParams.containsKey("tx_description")) {
-        final description = filteredParams.remove("tx_description")!;
-        if (filteredParams.isNotEmpty) {
-          uriString += Uri(queryParameters: filteredParams).toString();
-        }
-        uriString += "#${Uri.encodeComponent(description)}";
-      } else if (filteredParams.isNotEmpty) {
-        uriString += Uri(queryParameters: filteredParams).toString();
-      }
-    } else {
-      // General case for other cryptocurrencies.
-      if (filteredParams.isNotEmpty) {
-        uriString += Uri(queryParameters: filteredParams).toString();
-      }
+    if (filteredParams.isNotEmpty) {
+      uriString += Uri(queryParameters: filteredParams).toString();
     }
 
     return uriString;
   }
 
+  static String buildPaymentUriString({
+    required String scheme,
+    required String address,
+    String? amount,
+    String? message,
+  }) {
+    final normalizedScheme = scheme.toLowerCase();
+    final usesMoneroParameters =
+        normalizedScheme == "monero" || normalizedScheme == "wownero";
+    final params = <String, String>{
+      if (amount != null && amount.isNotEmpty)
+        usesMoneroParameters ? "tx_amount" : "amount": amount,
+      if (message != null && message.isNotEmpty)
+        usesMoneroParameters ? "tx_description" : "message": message,
+    };
+
+    return buildUriString(scheme, address, params);
+  }
+
   /// returns empty if bad data
   static Map<String, dynamic> decodeQRSeedData(String data) {
     Map<String, dynamic> result = {};
diff --git a/test/address_utils_test.dart b/test/address_utils_test.dart
index 059eb7a..dc1bd24 100644
--- a/test/address_utils_test.dart
+++ b/test/address_utils_test.dart
@@ -264,4 +264,38 @@ void main() {
       "firo:$firoAddress?amount=10.0123&message=Some+kind+of+message%21",
     );
   });
+
+  test("build a standard payment URI", () {
+    expect(
+      AddressUtils.buildPaymentUriString(
+        scheme: "firo",
+        address: firoAddress,
+        amount: "10.0123",
+        message: "Some kind of message!",
+      ),
+      "firo:$firoAddress?amount=10.0123&message=Some+kind+of+message%21",
+    );
+  });
+
+  test("build Monero-family payment URIs with standard query parameters", () {
+    for (final scheme in ["monero", "wownero"]) {
+      final uri = AddressUtils.buildPaymentUriString(
+        scheme: scheme,
+        address: firoAddress,
+        amount: "1.25",
+        message: "Some kind of message!",
+      );
+
+      expect(
+        uri,
+        "$scheme:$firoAddress?tx_amount=1.25&"
+        "tx_description=Some+kind+of+message%21",
+      );
+      expect(uri, isNot(contains("#")));
+
+      final parsed = AddressUtils.parsePaymentUri(uri);
+      expect(parsed?.amount, "1.25");
+      expect(parsed?.message, "Some kind of message!");
+    }
+  });
 }