diff --git a/lib/l10n/app_de.arb b/lib/l10n/app_de.arb
index 1bb8733..c73ba80 100644
--- a/lib/l10n/app_de.arb
+++ b/lib/l10n/app_de.arb
@@ -354,6 +354,15 @@
   "voucher_generic_error": "Voucher kann nicht verarbeitet werden",
   "voucher_generic_error_desc": "Es gab einen unerwarteten Fehler beim Verarbeiten dieses Vouchers. Bitte versuchen Sie es erneut oder kontaktieren Sie den Support.",
   
+  "currency_count": "{count, plural, =1{1 Währung} other{{count} Währungen}}",
+  "@currency_count": {
+    "description": "Number of currencies available",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "currency_validation_info": "Bei der Auswahl einer Währung wird überprüft, ob sie auf diesem Server verfügbar ist",
   "checking_currency_availability": "Überprüfung der Verfügbarkeit von {currency}...",
   "currency_added_successfully": "{currency} erfolgreich hinzugefügt",
@@ -376,6 +385,18 @@
   "nfc_charge_unknown_error": "Unbekannter Fehler beim Einziehen",
   "share_ready_message": "Bereit zum Teilen",
   "lnurl_copied_message": "LNURL in die Zwischenablage kopiert",
+  "invoice_key_qr_title": "Rechnungsschlüssel QR",
+  "invoice_key_qr_description": "Verwenden Sie diesen QR-Code mit LaChispaPOS oder anderen Lightning-Apps, um Zahlungen zu empfangen, ohne Ihren Admin-Schlüssel preiszugeben.",
+  "invoice_key_qr_subtitle": "QR für andere Apps anzeigen",
+  "copy_invoice_key": "Schlüssel kopieren",
+  "invoice_key_copied": "Rechnungsschlüssel in die Zwischenablage kopiert",
+  "invoice_key_unavailable_title": "Keine Wallet gefunden",
+  "invoice_key_unavailable_subtitle": "Bitte erstellen Sie zuerst eine Wallet",
+  "invoice_key_security_warning": "Dieser Schlüssel ermöglicht Dritten, Rechnungen zu erstellen. Nur mit vertrauenswürdigen POS-Geräten teilen. Nie öffentlich posten oder teilen.",
+  "invoice_key_show": "Schlüssel anzeigen",
+  "invoice_key_hide": "Schlüssel verbergen",
+  "invoice_key_copy_failed": "Rechnungsschlüssel konnte nicht kopiert werden",
+  "invoice_key_empty": "Rechnungsschlüssel darf nicht leer sein",
   "qr_scanner_title": "QR scannen",
   "qr_scanner_instructions": "Kamera auf den QR-Code richten\num Rechnung oder Adresse zu scannen"
 }
\ No newline at end of file
diff --git a/lib/l10n/app_en.arb b/lib/l10n/app_en.arb
index f25cd45..435eb5e 100644
--- a/lib/l10n/app_en.arb
+++ b/lib/l10n/app_en.arb
@@ -369,6 +369,15 @@
   "settings_screen_title": "Settings",
   "about_title": "About",
   
+  "currency_count": "{count, plural, =1{1 currency} other{{count} currencies}}",
+  "@currency_count": {
+    "description": "Number of currencies available",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "currency_validation_info": "When selecting a currency, it will be verified if it's available on this server",
   "checking_currency_availability": "Checking {currency} availability...",
   "currency_added_successfully": "{currency} added successfully",
@@ -391,6 +400,18 @@
   "nfc_charge_unknown_error": "Unknown error during charge",
   "share_ready_message": "Ready to share",
   "lnurl_copied_message": "LNURL copied to clipboard",
+  "invoice_key_qr_title": "Invoice Key QR",
+  "invoice_key_qr_description": "Use this QR code with LaChispaPOS or other Lightning apps to receive payments without exposing your admin key.",
+  "invoice_key_qr_subtitle": "Show QR for other apps",
+  "copy_invoice_key": "Copy Key",
+  "invoice_key_copied": "Invoice key copied to clipboard",
+  "invoice_key_unavailable_title": "No wallet found",
+  "invoice_key_unavailable_subtitle": "Create a wallet first",
+  "invoice_key_security_warning": "This key allows third parties to create invoices. Only share with trusted POS devices. Never post publicly or share widely.",
+  "invoice_key_show": "Show key",
+  "invoice_key_hide": "Hide key",
+  "invoice_key_copy_failed": "Failed to copy invoice key",
+  "invoice_key_empty": "Invoice key cannot be empty",
   "qr_scanner_title": "Scan QR",
   "qr_scanner_instructions": "Point the camera at the QR code\nto scan the invoice or address"
 }
\ No newline at end of file
diff --git a/lib/l10n/app_es.arb b/lib/l10n/app_es.arb
index 6d36fa9..476d0d1 100644
--- a/lib/l10n/app_es.arb
+++ b/lib/l10n/app_es.arb
@@ -354,6 +354,15 @@
   "settings_screen_title": "Configuración",
   "about_title": "Acerca de",
   
+  "currency_count": "{count, plural, =1{1 moneda} other{{count} monedas}}",
+  "@currency_count": {
+    "description": "Number of currencies available",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "currency_validation_info": "Al seleccionar una moneda, se verificará si está disponible en este servidor",
   "checking_currency_availability": "Verificando disponibilidad de {currency}...",
   "currency_added_successfully": "{currency} agregado correctamente",
@@ -376,6 +385,18 @@
   "nfc_charge_unknown_error": "Error desconocido al cobrar",
   "share_ready_message": "Listo para compartir",
   "lnurl_copied_message": "LNURL copiado al portapapeles",
+  "invoice_key_qr_title": "QR de Clave de Facturación",
+  "invoice_key_qr_description": "Usa este código QR con LaChispaPOS u otras apps Lightning para recibir pagos sin exponer tu clave de administrador.",
+  "invoice_key_qr_subtitle": "Mostrar QR para otras apps",
+  "copy_invoice_key": "Copiar Clave",
+  "invoice_key_copied": "Clave de facturación copiada al portapapeles",
+  "invoice_key_unavailable_title": "No se encontró billetera",
+  "invoice_key_unavailable_subtitle": "Crea una billetera primero",
+  "invoice_key_security_warning": "Esta clave permite a terceros crear facturas. Compártela solo con dispositivos POS de confianza. Nunca la publiques ni compartas públicamente.",
+  "invoice_key_show": "Mostrar clave",
+  "invoice_key_hide": "Ocultar clave",
+  "invoice_key_copy_failed": "No se pudo copiar la clave de facturación",
+  "invoice_key_empty": "La clave de facturación no puede estar vacía",
   "qr_scanner_title": "Escanear QR",
   "qr_scanner_instructions": "Apunta la cámara al código QR\npara escanear la factura o dirección"
 }
\ No newline at end of file
diff --git a/lib/l10n/app_fr.arb b/lib/l10n/app_fr.arb
index 6064bfe..bb579d9 100644
--- a/lib/l10n/app_fr.arb
+++ b/lib/l10n/app_fr.arb
@@ -354,6 +354,15 @@
   "voucher_generic_error": "Impossible de traiter le voucher",
   "voucher_generic_error_desc": "Il y a eu une erreur inattendue lors du traitement de ce voucher. Veuillez réessayer ou contacter le support.",
   
+  "currency_count": "{count, plural, =1{1 monnaie} other{{count} monnaies}}",
+  "@currency_count": {
+    "description": "Number of currencies available",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "currency_validation_info": "Lors de la sélection d'une devise, il sera vérifié si elle est disponible sur ce serveur",
   "checking_currency_availability": "Vérification de la disponibilité de {currency}...",
   "currency_added_successfully": "{currency} ajouté avec succès",
@@ -376,6 +385,18 @@
   "nfc_charge_unknown_error": "Erreur inconnue lors de l'encaissement",
   "share_ready_message": "Prêt à partager",
   "lnurl_copied_message": "LNURL copié dans le presse-papiers",
+  "invoice_key_qr_title": "QR de clé de facturation",
+  "invoice_key_qr_description": "Utilisez ce code QR avec LaChispaPOS ou d'autres applications Lightning pour recevoir des paiements sans exposer votre clé administrateur.",
+  "invoice_key_qr_subtitle": "Afficher le QR pour d'autres applications",
+  "copy_invoice_key": "Copier la clé",
+  "invoice_key_copied": "Clé de facturation copiée dans le presse-papiers",
+  "invoice_key_unavailable_title": "Aucun portefeuille trouvé",
+  "invoice_key_unavailable_subtitle": "Créez d'abord un portefeuille",
+  "invoice_key_security_warning": "Cette clé permet à des tiers de créer des factures. Ne la partagez qu'avec des appareils POS de confiance. Ne la publiez jamais publiquement.",
+  "invoice_key_show": "Afficher la clé",
+  "invoice_key_hide": "Masquer la clé",
+  "invoice_key_copy_failed": "Impossible de copier la clé de facturation",
+  "invoice_key_empty": "La clé de facturation ne peut pas être vide",
   "qr_scanner_title": "Scanner QR",
   "qr_scanner_instructions": "Pointez la caméra vers le code QR\npour scanner la facture ou l'adresse"
 }
\ No newline at end of file
diff --git a/lib/l10n/app_it.arb b/lib/l10n/app_it.arb
index 280ce6f..e77e137 100644
--- a/lib/l10n/app_it.arb
+++ b/lib/l10n/app_it.arb
@@ -354,6 +354,15 @@
   "voucher_generic_error": "Impossibile elaborare il voucher",
   "voucher_generic_error_desc": "C'è stato un errore imprevisto nell'elaborazione di questo voucher. Riprova o contatta il supporto.",
   
+  "currency_count": "{count, plural, =1{1 valuta} other{{count} valute}}",
+  "@currency_count": {
+    "description": "Number of currencies available",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "currency_validation_info": "Quando si seleziona una valuta, verrà verificato se è disponibile su questo server",
   "checking_currency_availability": "Verifica disponibilità di {currency}...",
   "currency_added_successfully": "{currency} aggiunto con successo",
@@ -376,6 +385,18 @@
   "nfc_charge_unknown_error": "Errore sconosciuto durante l'incasso",
   "share_ready_message": "Pronto da condividere",
   "lnurl_copied_message": "LNURL copiato negli appunti",
+  "invoice_key_qr_title": "QR Chiave fattura",
+  "invoice_key_qr_description": "Usa questo codice QR con LaChispaPOS o altre app Lightning per ricevere pagamenti senza esporre la tua chiave amministratore.",
+  "invoice_key_qr_subtitle": "Mostra QR per altre app",
+  "copy_invoice_key": "Copia chiave",
+  "invoice_key_copied": "Chiave fattura copiata negli appunti",
+  "invoice_key_unavailable_title": "Nessun portafoglio trovato",
+  "invoice_key_unavailable_subtitle": "Crea prima un portafoglio",
+  "invoice_key_security_warning": "Questa chiave permette a terzi di creare fatture. Condividi solo con dispositivi POS fidati. Non pubblicare mai pubblicamente.",
+  "invoice_key_show": "Mostra chiave",
+  "invoice_key_hide": "Nascondi chiave",
+  "invoice_key_copy_failed": "Impossibile copiare la chiave fattura",
+  "invoice_key_empty": "La chiave fattura non può essere vuota",
   "qr_scanner_title": "Scansiona QR",
   "qr_scanner_instructions": "Punta la fotocamera sul codice QR\nper scansionare la fattura o l'indirizzo"
 }
\ No newline at end of file
diff --git a/lib/l10n/app_pt.arb b/lib/l10n/app_pt.arb
index a42538f..55a008b 100644
--- a/lib/l10n/app_pt.arb
+++ b/lib/l10n/app_pt.arb
@@ -354,6 +354,15 @@
   "settings_screen_title": "Configurações",
   "about_title": "Sobre",
   
+  "currency_count": "{count, plural, =1{1 moeda} other{{count} moedas}}",
+  "@currency_count": {
+    "description": "Number of currencies available",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "currency_validation_info": "Ao selecionar uma moeda, será verificado se está disponível neste servidor",
   "checking_currency_availability": "Verificando disponibilidade de {currency}...",
   "currency_added_successfully": "{currency} adicionado com sucesso",
@@ -376,6 +385,18 @@
   "nfc_charge_unknown_error": "Erro desconhecido ao cobrar",
   "share_ready_message": "Pronto para compartilhar",
   "lnurl_copied_message": "LNURL copiado para a área de transferência",
+  "invoice_key_qr_title": "QR Chave da Fatura",
+  "invoice_key_qr_description": "Use este código QR com LaChispaPOS ou outros aplicativos Lightning para receber pagamentos sem expor sua chave de administrador.",
+  "invoice_key_qr_subtitle": "Mostrar QR para outros aplicativos",
+  "copy_invoice_key": "Copiar Chave",
+  "invoice_key_copied": "Chave da fatura copiada para a área de transferência",
+  "invoice_key_unavailable_title": "Nenhuma carteira encontrada",
+  "invoice_key_unavailable_subtitle": "Crie uma carteira primeiro",
+  "invoice_key_security_warning": "Esta chave permite que terceiros criem faturas. Compartilhe apenas com dispositivos POS confiáveis. Nunca publique publicamente.",
+  "invoice_key_show": "Mostrar chave",
+  "invoice_key_hide": "Ocultar chave",
+  "invoice_key_copy_failed": "Falha ao copiar a chave da fatura",
+  "invoice_key_empty": "A chave da fatura não pode estar vazia",
   "qr_scanner_title": "Escanear QR",
   "qr_scanner_instructions": "Aponte a câmera para o código QR\npara escanear a fatura ou endereço"
 }
\ No newline at end of file
diff --git a/lib/l10n/app_ru.arb b/lib/l10n/app_ru.arb
index c3ecd9e..c3446c5 100644
--- a/lib/l10n/app_ru.arb
+++ b/lib/l10n/app_ru.arb
@@ -354,6 +354,15 @@
   "voucher_generic_error": "Не удается обработать ваучер",
   "voucher_generic_error_desc": "Произошла неожиданная ошибка при обработке этого ваучера. Попробуйте еще раз или обратитесь в поддержку.",
   
+  "currency_count": "{count, plural, =1{1 валюта} other{{count} валют}}",
+  "@currency_count": {
+    "description": "Number of currencies available",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "currency_validation_info": "При выборе валюты будет проверено, доступна ли она на этом сервере",
   "checking_currency_availability": "Проверка доступности {currency}...",
   "currency_added_successfully": "{currency} успешно добавлен",
@@ -376,6 +385,18 @@
   "nfc_charge_unknown_error": "Неизвестная ошибка при списании",
   "share_ready_message": "Готово к отправке",
   "lnurl_copied_message": "LNURL скопирован в буфер обмена",
+  "invoice_key_qr_title": "QR Ключ счета",
+  "invoice_key_qr_description": "Используйте этот QR-код с LaChispaPOS или другими приложениями Lightning для получения платежей без раскрытия ключа администратора.",
+  "invoice_key_qr_subtitle": "Показать QR для других приложений",
+  "copy_invoice_key": "Копировать ключ",
+  "invoice_key_copied": "Ключ счета скопирован в буфер обмена",
+  "invoice_key_unavailable_title": "Кошелек не найден",
+  "invoice_key_unavailable_subtitle": "Сначала создайте кошелек",
+  "invoice_key_security_warning": "Этот ключ позволяет третьим лицам создавать счета. Делитесь только с доверенными POS-устройствами. Никогда не публикуйте публично.",
+  "invoice_key_show": "Показать ключ",
+  "invoice_key_hide": "Скрыть ключ",
+  "invoice_key_copy_failed": "Не удалось скопировать ключ счета",
+  "invoice_key_empty": "Ключ счета не может быть пустым",
   "qr_scanner_title": "Сканировать QR",
   "qr_scanner_instructions": "Наведите камеру на QR-код\nчтобы сканировать счёт или адрес"
 }
\ No newline at end of file
diff --git a/lib/l10n/generated/app_localizations.dart b/lib/l10n/generated/app_localizations.dart
index 6940bd6..9c54b22 100644
--- a/lib/l10n/generated/app_localizations.dart
+++ b/lib/l10n/generated/app_localizations.dart
@@ -68,7 +68,7 @@ import 'app_localizations_ru.dart';
 /// property.
 abstract class AppLocalizations {
   AppLocalizations(String locale)
-    : localeName = intl.Intl.canonicalizedLocale(locale.toString());
+      : localeName = intl.Intl.canonicalizedLocale(locale.toString());
 
   final String localeName;
 
@@ -91,11 +91,11 @@ abstract class AppLocalizations {
   /// of delegates is preferred or required.
   static const List<LocalizationsDelegate<dynamic>> localizationsDelegates =
       <LocalizationsDelegate<dynamic>>[
-        delegate,
-        GlobalMaterialLocalizations.delegate,
-        GlobalCupertinoLocalizations.delegate,
-        GlobalWidgetsLocalizations.delegate,
-      ];
+    delegate,
+    GlobalMaterialLocalizations.delegate,
+    GlobalCupertinoLocalizations.delegate,
+    GlobalWidgetsLocalizations.delegate,
+  ];
 
   /// A list of this localizations delegate's supported locales.
   static const List<Locale> supportedLocales = <Locale>[
@@ -105,7 +105,7 @@ abstract class AppLocalizations {
     Locale('fr'),
     Locale('it'),
     Locale('pt'),
-    Locale('ru'),
+    Locale('ru')
   ];
 
   /// No description provided for @welcome_title.
@@ -1794,6 +1794,12 @@ abstract class AppLocalizations {
   /// **'Acerca de'**
   String get about_title;
 
+  /// Number of currencies available
+  ///
+  /// In es, this message translates to:
+  /// **'{count, plural, =1{1 moneda} other{{count} monedas}}'**
+  String currency_count(int count);
+
   /// No description provided for @currency_validation_info.
   ///
   /// In es, this message translates to:
@@ -1914,6 +1920,78 @@ abstract class AppLocalizations {
   /// **'LNURL copiado al portapapeles'**
   String get lnurl_copied_message;
 
+  /// No description provided for @invoice_key_qr_title.
+  ///
+  /// In es, this message translates to:
+  /// **'QR de Clave de Facturación'**
+  String get invoice_key_qr_title;
+
+  /// No description provided for @invoice_key_qr_description.
+  ///
+  /// In es, this message translates to:
+  /// **'Usa este código QR con LaChispaPOS u otras apps Lightning para recibir pagos sin exponer tu clave de administrador.'**
+  String get invoice_key_qr_description;
+
+  /// No description provided for @invoice_key_qr_subtitle.
+  ///
+  /// In es, this message translates to:
+  /// **'Mostrar QR para otras apps'**
+  String get invoice_key_qr_subtitle;
+
+  /// No description provided for @copy_invoice_key.
+  ///
+  /// In es, this message translates to:
+  /// **'Copiar Clave'**
+  String get copy_invoice_key;
+
+  /// No description provided for @invoice_key_copied.
+  ///
+  /// In es, this message translates to:
+  /// **'Clave de facturación copiada al portapapeles'**
+  String get invoice_key_copied;
+
+  /// No description provided for @invoice_key_unavailable_title.
+  ///
+  /// In es, this message translates to:
+  /// **'No se encontró billetera'**
+  String get invoice_key_unavailable_title;
+
+  /// No description provided for @invoice_key_unavailable_subtitle.
+  ///
+  /// In es, this message translates to:
+  /// **'Crea una billetera primero'**
+  String get invoice_key_unavailable_subtitle;
+
+  /// No description provided for @invoice_key_security_warning.
+  ///
+  /// In es, this message translates to:
+  /// **'Esta clave permite a terceros crear facturas. Compártela solo con dispositivos POS de confianza. Nunca la publiques ni compartas públicamente.'**
+  String get invoice_key_security_warning;
+
+  /// No description provided for @invoice_key_show.
+  ///
+  /// In es, this message translates to:
+  /// **'Mostrar clave'**
+  String get invoice_key_show;
+
+  /// No description provided for @invoice_key_hide.
+  ///
+  /// In es, this message translates to:
+  /// **'Ocultar clave'**
+  String get invoice_key_hide;
+
+  /// No description provided for @invoice_key_copy_failed.
+  ///
+  /// In es, this message translates to:
+  /// **'No se pudo copiar la clave de facturación'**
+  String get invoice_key_copy_failed;
+
+  /// No description provided for @invoice_key_empty.
+  ///
+  /// In es, this message translates to:
+  /// **'La clave de facturación no puede estar vacía'**
+  String get invoice_key_empty;
+
   /// No description provided for @qr_scanner_title.
   ///
   /// In es, this message translates to:
@@ -1938,14 +2016,14 @@ class _AppLocalizationsDelegate
 
   @override
   bool isSupported(Locale locale) => <String>[
-    'de',
-    'en',
-    'es',
-    'fr',
-    'it',
-    'pt',
-    'ru',
-  ].contains(locale.languageCode);
+        'de',
+        'en',
+        'es',
+        'fr',
+        'it',
+        'pt',
+        'ru'
+      ].contains(locale.languageCode);
 
   @override
   bool shouldReload(_AppLocalizationsDelegate old) => false;
@@ -1971,9 +2049,8 @@ AppLocalizations lookupAppLocalizations(Locale locale) {
   }
 
   throw FlutterError(
-    'AppLocalizations.delegate failed to load unsupported locale "$locale". This is likely '
-    'an issue with the localizations generation tool. Please file an issue '
-    'on GitHub with a reproducible sample app and the gen-l10n configuration '
-    'that was used.',
-  );
+      'AppLocalizations.delegate failed to load unsupported locale "$locale". This is likely '
+      'an issue with the localizations generation tool. Please file an issue '
+      'on GitHub with a reproducible sample app and the gen-l10n configuration '
+      'that was used.');
 }
diff --git a/lib/l10n/generated/app_localizations_de.dart b/lib/l10n/generated/app_localizations_de.dart
index 9b80964..aaa35b9 100644
--- a/lib/l10n/generated/app_localizations_de.dart
+++ b/lib/l10n/generated/app_localizations_de.dart
@@ -934,6 +934,17 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get about_title => 'Über';
 
+  @override
+  String currency_count(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count Währungen',
+      one: '1 Währung',
+    );
+    return '$_temp0';
+  }
+
   @override
   String get currency_validation_info =>
       'Bei der Auswahl einer Währung wird überprüft, ob sie auf diesem Server verfügbar ist';
@@ -950,9 +961,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String currency_not_available_on_server(
-    Object currency,
-    Object currencyName,
-  ) {
+      Object currency, Object currencyName) {
     return '$currencyName ($currency) ist auf diesem Server nicht verfügbar';
   }
 
@@ -1008,6 +1017,47 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get lnurl_copied_message => 'LNURL in die Zwischenablage kopiert';
 
+  @override
+  String get invoice_key_qr_title => 'Rechnungsschlüssel QR';
+
+  @override
+  String get invoice_key_qr_description =>
+      'Verwenden Sie diesen QR-Code mit LaChispaPOS oder anderen Lightning-Apps, um Zahlungen zu empfangen, ohne Ihren Admin-Schlüssel preiszugeben.';
+
+  @override
+  String get invoice_key_qr_subtitle => 'QR für andere Apps anzeigen';
+
+  @override
+  String get copy_invoice_key => 'Schlüssel kopieren';
+
+  @override
+  String get invoice_key_copied =>
+      'Rechnungsschlüssel in die Zwischenablage kopiert';
+
+  @override
+  String get invoice_key_unavailable_title => 'Keine Wallet gefunden';
+
+  @override
+  String get invoice_key_unavailable_subtitle =>
+      'Bitte erstellen Sie zuerst eine Wallet';
+
+  @override
+  String get invoice_key_security_warning =>
+      'Dieser Schlüssel ermöglicht Dritten, Rechnungen zu erstellen. Nur mit vertrauenswürdigen POS-Geräten teilen. Nie öffentlich posten oder teilen.';
+
+  @override
+  String get invoice_key_show => 'Schlüssel anzeigen';
+
+  @override
+  String get invoice_key_hide => 'Schlüssel verbergen';
+
+  @override
+  String get invoice_key_copy_failed =>
+      'Rechnungsschlüssel konnte nicht kopiert werden';
+
+  @override
+  String get invoice_key_empty => 'Rechnungsschlüssel darf nicht leer sein';
+
   @override
   String get qr_scanner_title => 'QR scannen';
 
diff --git a/lib/l10n/generated/app_localizations_en.dart b/lib/l10n/generated/app_localizations_en.dart
index 9ae3142..54c6e05 100644
--- a/lib/l10n/generated/app_localizations_en.dart
+++ b/lib/l10n/generated/app_localizations_en.dart
@@ -909,6 +909,17 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get about_title => 'About';
 
+  @override
+  String currency_count(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count currencies',
+      one: '1 currency',
+    );
+    return '$_temp0';
+  }
+
   @override
   String get currency_validation_info =>
       'When selecting a currency, it will be verified if it\'s available on this server';
@@ -925,9 +936,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String currency_not_available_on_server(
-    Object currency,
-    Object currencyName,
-  ) {
+      Object currency, Object currencyName) {
     return '$currencyName ($currency) is not available on this server';
   }
 
@@ -983,6 +992,44 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get lnurl_copied_message => 'LNURL copied to clipboard';
 
+  @override
+  String get invoice_key_qr_title => 'Invoice Key QR';
+
+  @override
+  String get invoice_key_qr_description =>
+      'Use this QR code with LaChispaPOS or other Lightning apps to receive payments without exposing your admin key.';
+
+  @override
+  String get invoice_key_qr_subtitle => 'Show QR for other apps';
+
+  @override
+  String get copy_invoice_key => 'Copy Key';
+
+  @override
+  String get invoice_key_copied => 'Invoice key copied to clipboard';
+
+  @override
+  String get invoice_key_unavailable_title => 'No wallet found';
+
+  @override
+  String get invoice_key_unavailable_subtitle => 'Create a wallet first';
+
+  @override
+  String get invoice_key_security_warning =>
+      'This key allows third parties to create invoices. Only share with trusted POS devices. Never post publicly or share widely.';
+
+  @override
+  String get invoice_key_show => 'Show key';
+
+  @override
+  String get invoice_key_hide => 'Hide key';
+
+  @override
+  String get invoice_key_copy_failed => 'Failed to copy invoice key';
+
+  @override
+  String get invoice_key_empty => 'Invoice key cannot be empty';
+
   @override
   String get qr_scanner_title => 'Scan QR';
 
diff --git a/lib/l10n/generated/app_localizations_es.dart b/lib/l10n/generated/app_localizations_es.dart
index fd1d578..6f5e3f6 100644
--- a/lib/l10n/generated/app_localizations_es.dart
+++ b/lib/l10n/generated/app_localizations_es.dart
@@ -923,6 +923,17 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get about_title => 'Acerca de';
 
+  @override
+  String currency_count(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count monedas',
+      one: '1 moneda',
+    );
+    return '$_temp0';
+  }
+
   @override
   String get currency_validation_info =>
       'Al seleccionar una moneda, se verificará si está disponible en este servidor';
@@ -939,9 +950,7 @@ class AppLocalizationsEs extends AppLocalizations {
 
   @override
   String currency_not_available_on_server(
-    Object currency,
-    Object currencyName,
-  ) {
+      Object currency, Object currencyName) {
     return '$currencyName ($currency) no está disponible en este servidor';
   }
 
@@ -997,6 +1006,47 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get lnurl_copied_message => 'LNURL copiado al portapapeles';
 
+  @override
+  String get invoice_key_qr_title => 'QR de Clave de Facturación';
+
+  @override
+  String get invoice_key_qr_description =>
+      'Usa este código QR con LaChispaPOS u otras apps Lightning para recibir pagos sin exponer tu clave de administrador.';
+
+  @override
+  String get invoice_key_qr_subtitle => 'Mostrar QR para otras apps';
+
+  @override
+  String get copy_invoice_key => 'Copiar Clave';
+
+  @override
+  String get invoice_key_copied =>
+      'Clave de facturación copiada al portapapeles';
+
+  @override
+  String get invoice_key_unavailable_title => 'No se encontró billetera';
+
+  @override
+  String get invoice_key_unavailable_subtitle => 'Crea una billetera primero';
+
+  @override
+  String get invoice_key_security_warning =>
+      'Esta clave permite a terceros crear facturas. Compártela solo con dispositivos POS de confianza. Nunca la publiques ni compartas públicamente.';
+
+  @override
+  String get invoice_key_show => 'Mostrar clave';
+
+  @override
+  String get invoice_key_hide => 'Ocultar clave';
+
+  @override
+  String get invoice_key_copy_failed =>
+      'No se pudo copiar la clave de facturación';
+
+  @override
+  String get invoice_key_empty =>
+      'La clave de facturación no puede estar vacía';
+
   @override
   String get qr_scanner_title => 'Escanear QR';
 
diff --git a/lib/l10n/generated/app_localizations_fr.dart b/lib/l10n/generated/app_localizations_fr.dart
index 5738fa1..002fb71 100644
--- a/lib/l10n/generated/app_localizations_fr.dart
+++ b/lib/l10n/generated/app_localizations_fr.dart
@@ -939,6 +939,17 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get about_title => 'À propos';
 
+  @override
+  String currency_count(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count monnaies',
+      one: '1 monnaie',
+    );
+    return '$_temp0';
+  }
+
   @override
   String get currency_validation_info =>
       'Lors de la sélection d\'une devise, il sera vérifié si elle est disponible sur ce serveur';
@@ -955,9 +966,7 @@ class AppLocalizationsFr extends AppLocalizations {
 
   @override
   String currency_not_available_on_server(
-    Object currency,
-    Object currencyName,
-  ) {
+      Object currency, Object currencyName) {
     return '$currencyName ($currency) n\'est pas disponible sur ce serveur';
   }
 
@@ -1014,6 +1023,48 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get lnurl_copied_message => 'LNURL copié dans le presse-papiers';
 
+  @override
+  String get invoice_key_qr_title => 'QR de clé de facturation';
+
+  @override
+  String get invoice_key_qr_description =>
+      'Utilisez ce code QR avec LaChispaPOS ou d\'autres applications Lightning pour recevoir des paiements sans exposer votre clé administrateur.';
+
+  @override
+  String get invoice_key_qr_subtitle =>
+      'Afficher le QR pour d\'autres applications';
+
+  @override
+  String get copy_invoice_key => 'Copier la clé';
+
+  @override
+  String get invoice_key_copied =>
+      'Clé de facturation copiée dans le presse-papiers';
+
+  @override
+  String get invoice_key_unavailable_title => 'Aucun portefeuille trouvé';
+
+  @override
+  String get invoice_key_unavailable_subtitle =>
+      'Créez d\'abord un portefeuille';
+
+  @override
+  String get invoice_key_security_warning =>
+      'Cette clé permet à des tiers de créer des factures. Ne la partagez qu\'avec des appareils POS de confiance. Ne la publiez jamais publiquement.';
+
+  @override
+  String get invoice_key_show => 'Afficher la clé';
+
+  @override
+  String get invoice_key_hide => 'Masquer la clé';
+
+  @override
+  String get invoice_key_copy_failed =>
+      'Impossible de copier la clé de facturation';
+
+  @override
+  String get invoice_key_empty => 'La clé de facturation ne peut pas être vide';
+
   @override
   String get qr_scanner_title => 'Scanner QR';
 
diff --git a/lib/l10n/generated/app_localizations_it.dart b/lib/l10n/generated/app_localizations_it.dart
index e3af45f..bd6ea92 100644
--- a/lib/l10n/generated/app_localizations_it.dart
+++ b/lib/l10n/generated/app_localizations_it.dart
@@ -935,6 +935,17 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get about_title => 'Informazioni';
 
+  @override
+  String currency_count(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count valute',
+      one: '1 valuta',
+    );
+    return '$_temp0';
+  }
+
   @override
   String get currency_validation_info =>
       'Quando si seleziona una valuta, verrà verificato se è disponibile su questo server';
@@ -951,9 +962,7 @@ class AppLocalizationsIt extends AppLocalizations {
 
   @override
   String currency_not_available_on_server(
-    Object currency,
-    Object currencyName,
-  ) {
+      Object currency, Object currencyName) {
     return '$currencyName ($currency) non è disponibile su questo server';
   }
 
@@ -1011,6 +1020,44 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get lnurl_copied_message => 'LNURL copiato negli appunti';
 
+  @override
+  String get invoice_key_qr_title => 'QR Chiave fattura';
+
+  @override
+  String get invoice_key_qr_description =>
+      'Usa questo codice QR con LaChispaPOS o altre app Lightning per ricevere pagamenti senza esporre la tua chiave amministratore.';
+
+  @override
+  String get invoice_key_qr_subtitle => 'Mostra QR per altre app';
+
+  @override
+  String get copy_invoice_key => 'Copia chiave';
+
+  @override
+  String get invoice_key_copied => 'Chiave fattura copiata negli appunti';
+
+  @override
+  String get invoice_key_unavailable_title => 'Nessun portafoglio trovato';
+
+  @override
+  String get invoice_key_unavailable_subtitle => 'Crea prima un portafoglio';
+
+  @override
+  String get invoice_key_security_warning =>
+      'Questa chiave permette a terzi di creare fatture. Condividi solo con dispositivi POS fidati. Non pubblicare mai pubblicamente.';
+
+  @override
+  String get invoice_key_show => 'Mostra chiave';
+
+  @override
+  String get invoice_key_hide => 'Nascondi chiave';
+
+  @override
+  String get invoice_key_copy_failed => 'Impossibile copiare la chiave fattura';
+
+  @override
+  String get invoice_key_empty => 'La chiave fattura non può essere vuota';
+
   @override
   String get qr_scanner_title => 'Scansiona QR';
 
diff --git a/lib/l10n/generated/app_localizations_pt.dart b/lib/l10n/generated/app_localizations_pt.dart
index 485050a..1c80459 100644
--- a/lib/l10n/generated/app_localizations_pt.dart
+++ b/lib/l10n/generated/app_localizations_pt.dart
@@ -922,6 +922,17 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get about_title => 'Sobre';
 
+  @override
+  String currency_count(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count moedas',
+      one: '1 moeda',
+    );
+    return '$_temp0';
+  }
+
   @override
   String get currency_validation_info =>
       'Ao selecionar uma moeda, será verificado se está disponível neste servidor';
@@ -938,9 +949,7 @@ class AppLocalizationsPt extends AppLocalizations {
 
   @override
   String currency_not_available_on_server(
-    Object currency,
-    Object currencyName,
-  ) {
+      Object currency, Object currencyName) {
     return '$currencyName ($currency) não está disponível neste servidor';
   }
 
@@ -997,6 +1006,45 @@ class AppLocalizationsPt extends AppLocalizations {
   String get lnurl_copied_message =>
       'LNURL copiado para a área de transferência';
 
+  @override
+  String get invoice_key_qr_title => 'QR Chave da Fatura';
+
+  @override
+  String get invoice_key_qr_description =>
+      'Use este código QR com LaChispaPOS ou outros aplicativos Lightning para receber pagamentos sem expor sua chave de administrador.';
+
+  @override
+  String get invoice_key_qr_subtitle => 'Mostrar QR para outros aplicativos';
+
+  @override
+  String get copy_invoice_key => 'Copiar Chave';
+
+  @override
+  String get invoice_key_copied =>
+      'Chave da fatura copiada para a área de transferência';
+
+  @override
+  String get invoice_key_unavailable_title => 'Nenhuma carteira encontrada';
+
+  @override
+  String get invoice_key_unavailable_subtitle => 'Crie uma carteira primeiro';
+
+  @override
+  String get invoice_key_security_warning =>
+      'Esta chave permite que terceiros criem faturas. Compartilhe apenas com dispositivos POS confiáveis. Nunca publique publicamente.';
+
+  @override
+  String get invoice_key_show => 'Mostrar chave';
+
+  @override
+  String get invoice_key_hide => 'Ocultar chave';
+
+  @override
+  String get invoice_key_copy_failed => 'Falha ao copiar a chave da fatura';
+
+  @override
+  String get invoice_key_empty => 'A chave da fatura não pode estar vazia';
+
   @override
   String get qr_scanner_title => 'Escanear QR';
 
diff --git a/lib/l10n/generated/app_localizations_ru.dart b/lib/l10n/generated/app_localizations_ru.dart
index c5dc852..119a4c0 100644
--- a/lib/l10n/generated/app_localizations_ru.dart
+++ b/lib/l10n/generated/app_localizations_ru.dart
@@ -913,6 +913,17 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get about_title => 'Информация';
 
+  @override
+  String currency_count(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count валют',
+      one: '1 валюта',
+    );
+    return '$_temp0';
+  }
+
   @override
   String get currency_validation_info =>
       'При выборе валюты будет проверено, доступна ли она на этом сервере';
@@ -929,9 +940,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String currency_not_available_on_server(
-    Object currency,
-    Object currencyName,
-  ) {
+      Object currency, Object currencyName) {
     return '$currencyName ($currency) недоступна на этом сервере';
   }
 
@@ -987,6 +996,44 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get lnurl_copied_message => 'LNURL скопирован в буфер обмена';
 
+  @override
+  String get invoice_key_qr_title => 'QR Ключ счета';
+
+  @override
+  String get invoice_key_qr_description =>
+      'Используйте этот QR-код с LaChispaPOS или другими приложениями Lightning для получения платежей без раскрытия ключа администратора.';
+
+  @override
+  String get invoice_key_qr_subtitle => 'Показать QR для других приложений';
+
+  @override
+  String get copy_invoice_key => 'Копировать ключ';
+
+  @override
+  String get invoice_key_copied => 'Ключ счета скопирован в буфер обмена';
+
+  @override
+  String get invoice_key_unavailable_title => 'Кошелек не найден';
+
+  @override
+  String get invoice_key_unavailable_subtitle => 'Сначала создайте кошелек';
+
+  @override
+  String get invoice_key_security_warning =>
+      'Этот ключ позволяет третьим лицам создавать счета. Делитесь только с доверенными POS-устройствами. Никогда не публикуйте публично.';
+
+  @override
+  String get invoice_key_show => 'Показать ключ';
+
+  @override
+  String get invoice_key_hide => 'Скрыть ключ';
+
+  @override
+  String get invoice_key_copy_failed => 'Не удалось скопировать ключ счета';
+
+  @override
+  String get invoice_key_empty => 'Ключ счета не может быть пустым';
+
   @override
   String get qr_scanner_title => 'Сканировать QR';
 
diff --git a/lib/models/wallet_info.dart b/lib/models/wallet_info.dart
index a8774dc..6af1c85 100644
--- a/lib/models/wallet_info.dart
+++ b/lib/models/wallet_info.dart
@@ -4,6 +4,7 @@ class WalletInfo {
   final String name;
   final String adminKey;
   final String inKey;
+  final String readKey;
   final int balanceMsat;
 
   WalletInfo({
@@ -11,6 +12,7 @@ class WalletInfo {
     required this.name,
     required this.adminKey,
     required this.inKey,
+    required this.readKey,
     required this.balanceMsat,
   });
 
@@ -23,6 +25,7 @@ class WalletInfo {
       name: json['name'] as String,
       adminKey: json['adminkey'] ?? json['admin_key'] ?? json['adminKey'] ?? '',
       inKey: json['inkey'] ?? json['in_key'] ?? json['inKey'] ?? '',
+      readKey: json['readkey'] ?? json['read_key'] ?? json['readKey'] ?? '',
       balanceMsat: json['balance_msat'] ?? json['balance'] ?? 0,
     );
   }
@@ -33,6 +36,7 @@ class WalletInfo {
       'name': name,
       'adminkey': adminKey,
       'inkey': inKey,
+      'readkey': readKey,
       'balance_msat': balanceMsat,
     };
   }
@@ -83,9 +87,9 @@ class WalletBalance {
 
 class WalletException implements Exception {
   final String message;
-  
+
   WalletException(this.message);
-  
+
   @override
   String toString() => 'WalletException: $message';
-}
\ No newline at end of file
+}
diff --git a/lib/providers/wallet_provider.dart b/lib/providers/wallet_provider.dart
index 44aaa57..c87e122 100644
--- a/lib/providers/wallet_provider.dart
+++ b/lib/providers/wallet_provider.dart
@@ -5,18 +5,18 @@ import '../models/wallet_info.dart';
 
 class WalletProvider extends ChangeNotifier {
   final WalletService _walletService;
-  
+
   List<WalletInfo> _wallets = [];
   WalletInfo? _primaryWallet;
   bool _isLoading = false;
   bool _isInitialized = false;
   String? _error;
-  
+
   /// Callback to notify wallet changes to other providers
   Function(String walletId)? _onWalletChanged;
 
   WalletProvider(this._walletService);
-  
+
   void setOnWalletChangedCallback(Function(String walletId) callback) {
     _onWalletChanged = callback;
   }
@@ -27,12 +27,14 @@ class WalletProvider extends ChangeNotifier {
   }
 
   /// Save preferred wallet for user+server combination
-  Future<void> _savePreferredWallet(String serverUrl, String username, String walletId) async {
+  Future<void> _savePreferredWallet(
+      String serverUrl, String username, String walletId) async {
     try {
       final prefs = await SharedPreferences.getInstance();
       final key = _getPreferredWalletKey(serverUrl, username);
       await prefs.setString(key, walletId);
-      print('[WALLET_PROVIDER] Preferred wallet saved: $walletId for $username@$serverUrl');
+      print(
+          '[WALLET_PROVIDER] Preferred wallet saved: $walletId for $username@$serverUrl');
     } catch (e) {
       print('[WALLET_PROVIDER] Error saving preferred wallet: $e');
     }
@@ -44,7 +46,8 @@ class WalletProvider extends ChangeNotifier {
       final prefs = await SharedPreferences.getInstance();
       final key = _getPreferredWalletKey(serverUrl, username);
       final walletId = prefs.getString(key);
-      print('[WALLET_PROVIDER] Preferred wallet retrieved: $walletId for $username@$serverUrl');
+      print(
+          '[WALLET_PROVIDER] Preferred wallet retrieved: $walletId for $username@$serverUrl');
       return walletId;
     } catch (e) {
       print('[WALLET_PROVIDER] Error getting preferred wallet: $e');
@@ -60,7 +63,8 @@ class WalletProvider extends ChangeNotifier {
   bool get hasWallets => _wallets.isNotEmpty;
 
   int get primaryBalance => _primaryWallet?.balanceSats ?? 0;
-  String get primaryBalanceFormatted => _primaryWallet?.balanceFormatted ?? '0 sats';
+  String get primaryBalanceFormatted =>
+      _primaryWallet?.balanceFormatted ?? '0 sats';
   String? get primaryWalletId => _primaryWallet?.id;
 
   /// Initialize user wallets with saved preference restoration
@@ -76,19 +80,22 @@ class WalletProvider extends ChangeNotifier {
 
     try {
       print('[WALLET_PROVIDER] Initializing wallets...');
-      
-      final wallets = await _walletService.getUserWallets(
+
+      final wallets = await _walletService
+          .getUserWallets(
         serverUrl: serverUrl,
         authToken: authToken,
-      ).timeout(
+      )
+          .timeout(
         const Duration(seconds: 15),
         onTimeout: () {
-          throw WalletException('Timeout getting wallets - check your connection');
+          throw WalletException(
+              'Timeout getting wallets - check your connection');
         },
       );
 
       _wallets = wallets;
-      
+
       if (wallets.isNotEmpty) {
         await _establishPrimaryWallet(serverUrl, username, wallets);
       } else {
@@ -97,7 +104,6 @@ class WalletProvider extends ChangeNotifier {
 
       _isInitialized = true;
       print('[WALLET_PROVIDER] ${wallets.length} wallets initialized');
-      
     } catch (e) {
       _error = e.toString().replaceFirst('WalletException: ', '');
       print('[WALLET_PROVIDER] Error initializing wallets: $_error');
@@ -108,25 +114,29 @@ class WalletProvider extends ChangeNotifier {
   }
 
   /// Establish primary wallet based on saved preferences or fallback to first
-  Future<void> _establishPrimaryWallet(String serverUrl, String? username, List<WalletInfo> wallets) async {
+  Future<void> _establishPrimaryWallet(
+      String serverUrl, String? username, List<WalletInfo> wallets) async {
     WalletInfo? selectedWallet;
-    
+
     if (username != null) {
       final preferredWalletId = await _getPreferredWallet(serverUrl, username);
       if (preferredWalletId != null) {
-        selectedWallet = wallets.where((w) => w.id == preferredWalletId).firstOrNull;
+        selectedWallet =
+            wallets.where((w) => w.id == preferredWalletId).firstOrNull;
         if (selectedWallet != null) {
-          print('[WALLET_PROVIDER] Using preferred wallet: ${selectedWallet.name}');
+          print(
+              '[WALLET_PROVIDER] Using preferred wallet: ${selectedWallet.name}');
         } else {
           print('[WALLET_PROVIDER] Preferred wallet not found, using first');
         }
       }
     }
-    
+
     selectedWallet ??= wallets.first;
-    
+
     _primaryWallet = selectedWallet;
-    print('[WALLET_PROVIDER] Primary wallet established: ${_primaryWallet!.name}');
+    print(
+        '[WALLET_PROVIDER] Primary wallet established: ${_primaryWallet!.name}');
     print('[WALLET_PROVIDER] Balance: ${_primaryWallet!.balanceFormatted}');
   }
 
@@ -141,7 +151,7 @@ class WalletProvider extends ChangeNotifier {
 
     try {
       print('[WALLET_PROVIDER] Refreshing balance...');
-      
+
       final balance = await _walletService.getWalletBalance(
         serverUrl: serverUrl,
         walletId: _primaryWallet!.id,
@@ -153,6 +163,7 @@ class WalletProvider extends ChangeNotifier {
         name: _primaryWallet!.name,
         adminKey: _primaryWallet!.adminKey,
         inKey: _primaryWallet!.inKey,
+        readKey: _primaryWallet!.readKey,
         balanceMsat: balance.balanceMsat,
       );
 
@@ -165,29 +176,30 @@ class WalletProvider extends ChangeNotifier {
 
       notifyListeners();
       print('[WALLET_PROVIDER] Balance updated: ${balance.balanceFormatted}');
-      
     } catch (e) {
-      _error = 'Error refreshing balance: ${e.toString().replaceFirst('WalletException: ', '')}';
+      _error =
+          'Error refreshing balance: ${e.toString().replaceFirst('WalletException: ', '')}';
       print('[WALLET_PROVIDER] Error refreshing balance: $_error');
       notifyListeners();
     }
   }
 
   /// Change primary wallet and notify LNAddressProvider of wallet change
-  Future<void> setPrimaryWallet(WalletInfo wallet, {String? serverUrl, String? username}) async {
+  Future<void> setPrimaryWallet(WalletInfo wallet,
+      {String? serverUrl, String? username}) async {
     if (_wallets.contains(wallet)) {
       final previousWalletId = _primaryWallet?.id;
       _primaryWallet = wallet;
       print('[WALLET_PROVIDER] Primary wallet changed to: ${wallet.name}');
-      
+
       if (serverUrl != null && username != null) {
         await _savePreferredWallet(serverUrl, username, wallet.id);
       }
-      
+
       if (previousWalletId != wallet.id) {
         _onWalletChanged?.call(wallet.id);
       }
-      
+
       notifyListeners();
     }
   }
@@ -203,7 +215,7 @@ class WalletProvider extends ChangeNotifier {
 
     try {
       print('[WALLET_PROVIDER] Creating new wallet: $walletName');
-      
+
       final newWallet = await _walletService.createWallet(
         serverUrl: serverUrl,
         authToken: authToken,
@@ -211,7 +223,7 @@ class WalletProvider extends ChangeNotifier {
       );
 
       _wallets.add(newWallet);
-      
+
       if (_wallets.length == 1) {
         _primaryWallet = newWallet;
       }
@@ -219,7 +231,6 @@ class WalletProvider extends ChangeNotifier {
       notifyListeners();
       print('[WALLET_PROVIDER] Wallet created successfully: ${newWallet.name}');
       return true;
-      
     } catch (e) {
       _error = e.toString().replaceFirst('WalletException: ', '');
       print('[WALLET_PROVIDER] Error creating wallet: $_error');
@@ -246,7 +257,7 @@ class WalletProvider extends ChangeNotifier {
 
     try {
       print('[WALLET_PROVIDER] Deleting wallet: ${wallet.name}');
-      
+
       await _walletService.deleteWallet(
         serverUrl: serverUrl,
         walletId: wallet.id,
@@ -254,7 +265,7 @@ class WalletProvider extends ChangeNotifier {
       );
 
       _wallets.removeWhere((w) => w.id == wallet.id);
-      
+
       if (_primaryWallet?.id == wallet.id && _wallets.isNotEmpty) {
         _primaryWallet = _wallets.first;
         print('[WALLET_PROVIDER] New primary wallet: ${_primaryWallet!.name}');
@@ -263,7 +274,6 @@ class WalletProvider extends ChangeNotifier {
       notifyListeners();
       print('[WALLET_PROVIDER] Wallet deleted successfully');
       return true;
-      
     } catch (e) {
       _error = e.toString().replaceFirst('WalletException: ', '');
       print('[WALLET_PROVIDER] Error deleting wallet: $_error');
@@ -300,10 +310,10 @@ class WalletProvider extends ChangeNotifier {
   @override
   String toString() {
     return 'WalletProvider('
-           'wallets: ${_wallets.length}, '
-           'primary: ${_primaryWallet?.name}, '
-           'isLoading: $_isLoading, '
-           'isInitialized: $_isInitialized'
-           ')';
+        'wallets: ${_wallets.length}, '
+        'primary: ${_primaryWallet?.name}, '
+        'isLoading: $_isLoading, '
+        'isInitialized: $_isInitialized'
+        ')';
   }
-}
\ No newline at end of file
+}
diff --git a/lib/screens/17settings_screen.dart b/lib/screens/17settings_screen.dart
index 0dd12ef..94fcb70 100644
--- a/lib/screens/17settings_screen.dart
+++ b/lib/screens/17settings_screen.dart
@@ -2,12 +2,11 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../providers/language_provider.dart';
 import '../providers/currency_settings_provider.dart';
-import '../providers/theme_provider.dart';
 import '../l10n/generated/app_localizations.dart';
-import '../theme/app_tokens.dart';
 import '7ln_address_screen.dart';
 import '16currency_settings_screen.dart';
 import '18language_selection_screen.dart';
+import '19invoice_key_screen.dart';
 
 class SettingsScreen extends StatefulWidget {
   const SettingsScreen({super.key});
@@ -19,29 +18,40 @@ class SettingsScreen extends StatefulWidget {
 class _SettingsScreenState extends State<SettingsScreen> {
   @override
   Widget build(BuildContext context) {
-    final t = context.tokens;
     return Scaffold(
       body: Container(
         width: double.infinity,
         height: double.infinity,
-        decoration: BoxDecoration(gradient: t.backgroundGradient),
+        decoration: const BoxDecoration(
+          gradient: LinearGradient(
+            begin: Alignment.topLeft,
+            end: Alignment.bottomRight,
+            colors: [
+              Color(0xFF0F1419),
+              Color(0xFF1A1D47),
+              Color(0xFF2D3FE7),
+            ],
+            stops: [0.0, 0.5, 1.0],
+          ),
+        ),
         child: SafeArea(
           child: Column(
             children: [
               // Header with back button
-              _buildHeader(t),
+              _buildHeader(),
 
               // Settings list
               Expanded(
                 child: ListView(
-                  padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
+                  padding:
+                      const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
                   children: [
                     // Lightning Address
                     _buildSettingsItem(
-                      t: t,
                       icon: Icons.alternate_email,
-                      iconColor: t.accentSolid,
-                      title: AppLocalizations.of(context)!.lightning_address_title,
+                      iconColor: const Color(0xFF4C63F7),
+                      title:
+                          AppLocalizations.of(context)!.lightning_address_title,
                       onTap: () {
                         Navigator.push(
                           context,
@@ -54,20 +64,42 @@ class _SettingsScreenState extends State<SettingsScreen> {
 
                     const SizedBox(height: 12),
 
+                    // Invoice Key QR
+                    _buildSettingsItem(
+                      icon: Icons.qr_code,
+                      iconColor: const Color(0xFF4C63F7),
+                      title: AppLocalizations.of(context)!.invoice_key_qr_title,
+                      subtitle:
+                          AppLocalizations.of(context)!.invoice_key_qr_subtitle,
+                      onTap: () {
+                        Navigator.push(
+                          context,
+                          MaterialPageRoute(
+                            builder: (context) => const InvoiceKeyScreen(),
+                          ),
+                        );
+                      },
+                    ),
+
+                    const SizedBox(height: 12),
+
                     // Currency Settings
                     Consumer<CurrencySettingsProvider>(
                       builder: (context, currencyProvider, child) {
                         return _buildSettingsItem(
-                          t: t,
                           icon: Icons.attach_money,
-                          iconColor: t.accentSolid,
-                          title: AppLocalizations.of(context)!.currency_settings_title,
-                          subtitle: '${currencyProvider.availableCurrencies.length} currencies',
+                          iconColor: const Color(0xFF4C63F7),
+                          title: AppLocalizations.of(context)!
+                              .currency_settings_title,
+                          subtitle: AppLocalizations.of(context)!
+                              .currency_count(
+                                  currencyProvider.availableCurrencies.length),
                           onTap: () {
                             Navigator.push(
                               context,
                               MaterialPageRoute(
-                                builder: (context) => const CurrencySettingsScreen(),
+                                builder: (context) =>
+                                    const CurrencySettingsScreen(),
                               ),
                             );
                           },
@@ -81,36 +113,21 @@ class _SettingsScreenState extends State<SettingsScreen> {
                     Consumer<LanguageProvider>(
                       builder: (context, languageProvider, child) {
                         return _buildSettingsItem(
-                          t: t,
                           icon: Icons.language,
-                          iconColor: t.accentSolid,
-                          title: AppLocalizations.of(context)!.language_selector_title,
+                          iconColor: const Color(0xFF4C63F7),
+                          title: AppLocalizations.of(context)!
+                              .language_selector_title,
                           subtitle: languageProvider.getCurrentLanguageName(),
                           onTap: () => Navigator.push(
                             context,
                             MaterialPageRoute(
-                              builder: (context) => const LanguageSelectionScreen(),
+                              builder: (context) =>
+                                  const LanguageSelectionScreen(),
                             ),
                           ),
                         );
                       },
                     ),
-
-                    const SizedBox(height: 12),
-
-                    // Theme Settings
-                    Consumer<ThemeProvider>(
-                      builder: (context, themeProvider, child) {
-                        return _buildSettingsItem(
-                          t: t,
-                          icon: _themeIcon(themeProvider.current),
-                          iconColor: t.accentSolid,
-                          title: AppLocalizations.of(context)!.theme_selector_title,
-                          subtitle: _themeLabel(context, themeProvider.current),
-                          onTap: () => _showThemeSelector(themeProvider),
-                        );
-                      },
-                    ),
                   ],
                 ),
               ),
@@ -121,7 +138,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
     );
   }
 
-  Widget _buildHeader(AppTokens t) {
+  Widget _buildHeader() {
     return Padding(
       padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
       child: Row(
@@ -131,13 +148,12 @@ class _SettingsScreenState extends State<SettingsScreen> {
             child: Container(
               padding: const EdgeInsets.all(8),
               decoration: BoxDecoration(
-                color: t.surface,
+                color: Colors.white.withValues(alpha: 0.1),
                 borderRadius: BorderRadius.circular(12),
-                border: Border.all(color: t.outline, width: 1),
               ),
-              child: Icon(
+              child: const Icon(
                 Icons.arrow_back,
-                color: t.textPrimary,
+                color: Colors.white,
                 size: 24,
               ),
             ),
@@ -147,9 +163,10 @@ class _SettingsScreenState extends State<SettingsScreen> {
             child: Text(
               AppLocalizations.of(context)!.settings_screen_title,
               style: TextStyle(
+                fontFamily: 'Inter',
                 fontSize: 20,
                 fontWeight: FontWeight.w600,
-                color: t.textPrimary,
+                color: Colors.white,
               ),
             ),
           ),
@@ -159,7 +176,6 @@ class _SettingsScreenState extends State<SettingsScreen> {
   }
 
   Widget _buildSettingsItem({
-    required AppTokens t,
     required IconData icon,
     required Color iconColor,
     required String title,
@@ -171,10 +187,10 @@ class _SettingsScreenState extends State<SettingsScreen> {
       child: Container(
         padding: const EdgeInsets.all(16),
         decoration: BoxDecoration(
-          color: t.surface,
+          color: Colors.white.withValues(alpha: 0.08),
           borderRadius: BorderRadius.circular(16),
           border: Border.all(
-            color: t.outline,
+            color: Colors.white.withValues(alpha: 0.1),
             width: 1,
           ),
         ),
@@ -199,10 +215,11 @@ class _SettingsScreenState extends State<SettingsScreen> {
                 children: [
                   Text(
                     title,
-                    style: TextStyle(
+                    style: const TextStyle(
+                      fontFamily: 'Inter',
                       fontSize: 16,
                       fontWeight: FontWeight.w600,
-                      color: t.textPrimary,
+                      color: Colors.white,
                     ),
                   ),
                   if (subtitle != null) ...[
@@ -210,9 +227,10 @@ class _SettingsScreenState extends State<SettingsScreen> {
                     Text(
                       subtitle,
                       style: TextStyle(
+                        fontFamily: 'Inter',
                         fontSize: 14,
                         fontWeight: FontWeight.w400,
-                        color: t.textSecondary,
+                        color: Colors.white.withValues(alpha: 0.6),
                       ),
                     ),
                   ],
@@ -222,14 +240,13 @@ class _SettingsScreenState extends State<SettingsScreen> {
             Icon(
               Icons.arrow_forward_ios,
               size: 16,
-              color: t.textSecondary,
+              color: Colors.white.withValues(alpha: 0.5),
             ),
           ],
         ),
       ),
     );
   }
-
   IconData _themeIcon(AppTheme theme) {
     switch (theme) {
       case AppTheme.lachispa:
diff --git a/lib/screens/19invoice_key_screen.dart b/lib/screens/19invoice_key_screen.dart
new file mode 100644
index 0000000..6431e76
--- /dev/null
+++ b/lib/screens/19invoice_key_screen.dart
@@ -0,0 +1,320 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:provider/provider.dart';
+import 'package:qr_flutter/qr_flutter.dart';
+import '../providers/wallet_provider.dart';
+import '../l10n/generated/app_localizations.dart';
+
+class InvoiceKeyScreen extends StatefulWidget {
+  const InvoiceKeyScreen({super.key});
+
+  @override
+  State<InvoiceKeyScreen> createState() => _InvoiceKeyScreenState();
+}
+
+class _InvoiceKeyScreenState extends State<InvoiceKeyScreen> {
+  bool _isKeyVisible = false;
+
+  String _maskKey(String key) {
+    if (key.length <= 8) return '•' * key.length;
+    return '${key.substring(0, 4)}${'•' * (key.length - 8)}${key.substring(key.length - 4)}';
+  }
+
+  Future<void> _copyToClipboard(BuildContext context, String key) async {
+    try {
+      await Clipboard.setData(ClipboardData(text: key));
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text(AppLocalizations.of(context)!.invoice_key_copied),
+            backgroundColor: Colors.green,
+          ),
+        );
+      }
+    } catch (e) {
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text(AppLocalizations.of(context)!.invoice_key_copy_failed),
+            backgroundColor: Colors.red,
+          ),
+        );
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Container(
+        width: double.infinity,
+        height: double.infinity,
+        decoration: const BoxDecoration(
+          gradient: LinearGradient(
+            begin: Alignment.topLeft,
+            end: Alignment.bottomRight,
+            colors: [
+              Color(0xFF0F1419),
+              Color(0xFF1A1D47),
+              Color(0xFF2D3FE7),
+            ],
+            stops: [0.0, 0.5, 1.0],
+          ),
+        ),
+        child: SafeArea(
+          child: Column(
+            children: [
+              _buildHeader(context),
+              Expanded(
+                child: _buildContent(context),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildHeader(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
+      child: Row(
+        children: [
+          GestureDetector(
+            onTap: () => Navigator.pop(context),
+            child: Container(
+              padding: const EdgeInsets.all(8),
+              decoration: BoxDecoration(
+                color: Colors.white.withValues(alpha: 0.1),
+                borderRadius: BorderRadius.circular(12),
+              ),
+              child: const Icon(
+                Icons.arrow_back,
+                color: Colors.white,
+                size: 24,
+              ),
+            ),
+          ),
+          const SizedBox(width: 16),
+          Expanded(
+            child: Text(
+              AppLocalizations.of(context)!.invoice_key_qr_title,
+              style: const TextStyle(
+                fontFamily: 'Inter',
+                fontSize: 20,
+                fontWeight: FontWeight.w600,
+                color: Colors.white,
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildContent(BuildContext context) {
+    return Consumer<WalletProvider>(
+      builder: (context, walletProvider, child) {
+        final wallet = walletProvider.primaryWallet;
+        final invoiceKey = (wallet?.readKey ?? '').isEmpty
+            ? (wallet?.inKey ?? '')
+            : (wallet?.readKey ?? '');
+
+        if (wallet == null || invoiceKey.isEmpty) {
+          return Center(
+            child: Padding(
+              padding: const EdgeInsets.all(24),
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  const Icon(
+                    Icons.warning_amber_rounded,
+                    color: Colors.orange,
+                    size: 64,
+                  ),
+                  const SizedBox(height: 16),
+                  Text(
+                    AppLocalizations.of(context)!.invoice_key_unavailable_title,
+                    style: TextStyle(
+                      fontFamily: 'Inter',
+                      fontSize: 18,
+                      fontWeight: FontWeight.w600,
+                      color: Colors.white.withValues(alpha: 0.9),
+                    ),
+                  ),
+                  const SizedBox(height: 8),
+                  Text(
+                    AppLocalizations.of(context)!.invoice_key_unavailable_subtitle,
+                    style: TextStyle(
+                      fontFamily: 'Inter',
+                      fontSize: 14,
+                      color: Colors.white.withValues(alpha: 0.6),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          );
+        }
+
+        return SingleChildScrollView(
+          padding: const EdgeInsets.symmetric(horizontal: 24),
+          child: Column(
+            children: [
+              const SizedBox(height: 20),
+              _buildQRCode(invoiceKey),
+              const SizedBox(height: 24),
+              _buildKeyInfo(context, invoiceKey),
+              const SizedBox(height: 24),
+              _buildCopyButton(context, invoiceKey),
+              const SizedBox(height: 24),
+              _buildWarning(context),
+            ],
+          ),
+        );
+      },
+    );
+  }
+
+  Widget _buildQRCode(String invoiceKey) {
+    return Container(
+      padding: const EdgeInsets.all(20),
+      decoration: BoxDecoration(
+        color: Colors.white,
+        borderRadius: BorderRadius.circular(20),
+        boxShadow: [
+          BoxShadow(
+            color: Colors.black.withValues(alpha: 0.3),
+            blurRadius: 20,
+            offset: const Offset(0, 10),
+          ),
+        ],
+      ),
+      child: QrImageView(
+        data: invoiceKey,
+        version: QrVersions.auto,
+        size: 220.0,
+        backgroundColor: Colors.white,
+        errorCorrectionLevel: QrErrorCorrectLevel.H,
+      ),
+    );
+  }
+
+  Widget _buildKeyInfo(BuildContext context, String invoiceKey) {
+    return Container(
+      width: double.infinity,
+      padding: const EdgeInsets.all(16),
+      decoration: BoxDecoration(
+        color: Colors.white.withValues(alpha: 0.08),
+        borderRadius: BorderRadius.circular(16),
+        border: Border.all(
+          color: Colors.white.withValues(alpha: 0.1),
+          width: 1,
+        ),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: [
+              Text(
+                AppLocalizations.of(context)!.invoice_key_qr_title,
+                style: TextStyle(
+                  fontFamily: 'Inter',
+                  fontSize: 14,
+                  fontWeight: FontWeight.w500,
+                  color: Colors.white.withValues(alpha: 0.6),
+                ),
+              ),
+              GestureDetector(
+                onTap: () {
+                  setState(() {
+                    _isKeyVisible = !_isKeyVisible;
+                  });
+                },
+                child: Icon(
+                  _isKeyVisible ? Icons.visibility_off : Icons.visibility,
+                  color: Colors.white70,
+                  size: 20,
+                ),
+              ),
+            ],
+          ),
+          const SizedBox(height: 8),
+          Text(
+            _isKeyVisible ? invoiceKey : _maskKey(invoiceKey),
+            style: const TextStyle(
+              fontFamily: 'monospace',
+              fontSize: 12,
+              color: Colors.white,
+            ),
+            maxLines: 2,
+            overflow: TextOverflow.ellipsis,
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildCopyButton(BuildContext context, String invoiceKey) {
+    return SizedBox(
+      width: double.infinity,
+      child: ElevatedButton.icon(
+        onPressed: () => _copyToClipboard(context, invoiceKey),
+        icon: const Icon(Icons.copy, size: 20),
+        label: Text(
+          AppLocalizations.of(context)!.copy_invoice_key,
+          style: const TextStyle(
+            fontFamily: 'Inter',
+            fontSize: 16,
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+        style: ElevatedButton.styleFrom(
+          backgroundColor: const Color(0xFF4C63F7),
+          foregroundColor: Colors.white,
+          padding: const EdgeInsets.symmetric(vertical: 16),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(12),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildWarning(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.all(16),
+      decoration: BoxDecoration(
+        color: Colors.amber.withValues(alpha: 0.1),
+        borderRadius: BorderRadius.circular(12),
+        border: Border.all(
+          color: Colors.amber.withValues(alpha: 0.3),
+          width: 1,
+        ),
+      ),
+      child: Row(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          const Icon(
+            Icons.info_outline,
+            color: Colors.amber,
+            size: 24,
+          ),
+          const SizedBox(width: 12),
+          Expanded(
+            child: Text(
+              AppLocalizations.of(context)!.invoice_key_security_warning,
+              style: TextStyle(
+                fontFamily: 'Inter',
+                fontSize: 14,
+                color: Colors.white.withValues(alpha: 0.8),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}