diff --git a/flutter/Makefile b/flutter/Makefile
index 5b85b37..1ca4588 100644
--- a/flutter/Makefile
+++ b/flutter/Makefile
@@ -1,11 +1,5 @@
 
 
-# Setup
-#
-# flutter config --jdk-dir "/usr/lib/jvm/default-runtime/bin"
-# sudo archlinux-java set java-17-openjdk
-#
-
 HASH=$(shell git rev-parse HEAD)
 VERS=$(shell cat pubspec.yaml | grep -oP '(?<=version: ).*') # lazy evaluated!
 
@@ -38,11 +32,21 @@ install-release: java gen
 build-release: java gen
 	flutter build apk       --release
 	cp build/app/outputs/flutter-apk/app-release.apk "_releases/v$(VERS)-release.apk"
+	@echo ""
+	@echo "--> copied APK to _releases  ( Version: $(VERS) )"
+	@echo ""
 	flutter build appbundle --release
 	cp build/app/outputs/bundle/release/app-release.aab "_releases/v$(VERS)-release.aab"
+	@echo ""
+	@echo "--> copied AAB to _releases  ( Version: $(VERS) )"
+	@echo ""
 	flutter build linux     --release
 	cp -r build/linux/x64/release/bundle "_releases/v$(VERS)-linux-release"
 	tar -czf "_releases/v$(VERS)-linux-release.tar.gz" -C build/linux/x64/release/bundle .
+	@echo ""
+	@echo "--> copied linux-binary to _releases  ( Version: $(VERS) )"
+	@echo ""
+	@echo "Done."
 
 test:
 	dart analyze
diff --git a/flutter/lib/main.dart b/flutter/lib/main.dart
index a67548b..55f4e86 100644
--- a/flutter/lib/main.dart
+++ b/flutter/lib/main.dart
@@ -1,8 +1,10 @@
+import 'dart:async';
 import 'dart:io';
 
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:in_app_purchase/in_app_purchase.dart';
 import 'package:provider/provider.dart';
 import 'package:simplecloudnotifier/main_messaging.dart';
 import 'package:simplecloudnotifier/main_utils.dart';
@@ -151,11 +153,48 @@ void main() async {
   );
 }
 
-class SCNApp extends StatelessWidget {
+class SCNApp extends StatefulWidget {
   SCNApp({super.key});
 
   static var materialKey = GlobalKey<NavigatorState>();
 
+  @override
+  State<SCNApp> createState() => _SCNAppState();
+}
+
+class _SCNAppState extends State<SCNApp> {
+  StreamSubscription<List<PurchaseDetails>>? _purchaseSubscription;
+
+  @override
+  void initState() {
+    _purchaseSubscription = InAppPurchase.instance.purchaseStream.listen(
+      purchaseUpdated,
+      onDone: () => _purchaseSubscription?.cancel(),
+      onError: purchaseError,
+    );
+    super.initState();
+  }
+
+  @override
+  void dispose() {
+    _purchaseSubscription?.cancel();
+    _purchaseSubscription = null;
+    super.dispose();
+  }
+
+  void purchaseUpdated(List<PurchaseDetails> purchaseDetailsList) {
+    // see https://pub.dev/packages/in_app_purchase
+
+    for (var purchaseDetails in purchaseDetailsList) {
+      ApplicationLog.debug('Purchase ${purchaseDetails.productID} is ${purchaseDetails.status.toString()}'); //TODO
+    }
+  }
+
+  void purchaseError(dynamic error) {
+    // TODO handle error here.
+    ApplicationLog.error('Purchase error: ${error.toString()}', trace: StackTrace.current);
+  }
+
   @override
   Widget build(BuildContext context) {
     return ToastificationWrapper(
diff --git a/flutter/macos/Flutter/GeneratedPluginRegistrant.swift b/flutter/macos/Flutter/GeneratedPluginRegistrant.swift
index 1be595f..cfb5e47 100644
--- a/flutter/macos/Flutter/GeneratedPluginRegistrant.swift
+++ b/flutter/macos/Flutter/GeneratedPluginRegistrant.swift
@@ -9,6 +9,7 @@ import device_info_plus
 import firebase_core
 import firebase_messaging
 import flutter_local_notifications
+import in_app_purchase_storekit
 import mobile_scanner
 import package_info_plus
 import path_provider_foundation
@@ -21,6 +22,7 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   FLTFirebaseCorePlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseCorePlugin"))
   FLTFirebaseMessagingPlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseMessagingPlugin"))
   FlutterLocalNotificationsPlugin.register(with: registry.registrar(forPlugin: "FlutterLocalNotificationsPlugin"))
+  InAppPurchasePlugin.register(with: registry.registrar(forPlugin: "InAppPurchasePlugin"))
   MobileScannerPlugin.register(with: registry.registrar(forPlugin: "MobileScannerPlugin"))
   FPPPackageInfoPlusPlugin.register(with: registry.registrar(forPlugin: "FPPPackageInfoPlusPlugin"))
   PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
diff --git a/flutter/pubspec.lock b/flutter/pubspec.lock
index 869d595..740d583 100644
--- a/flutter/pubspec.lock
+++ b/flutter/pubspec.lock
@@ -540,6 +540,38 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.5.4"
+  in_app_purchase:
+    dependency: "direct main"
+    description:
+      name: in_app_purchase
+      sha256: "5cddd7f463f3bddb1d37a72b95066e840d5822d66291331d7f8f05ce32c24b6c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.3"
+  in_app_purchase_android:
+    dependency: transitive
+    description:
+      name: in_app_purchase_android
+      sha256: fd76e5612da6facadcfe8a3477da092908227260a9f6ec7db9a66dd989c69b02
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.4.0+2"
+  in_app_purchase_platform_interface:
+    dependency: transitive
+    description:
+      name: in_app_purchase_platform_interface
+      sha256: "1d353d38251da5b9fea6635c0ebfc6bb17a2d28d0e86ea5e083bf64244f1fb4c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  in_app_purchase_storekit:
+    dependency: transitive
+    description:
+      name: in_app_purchase_storekit
+      sha256: "9c2b438aa8ef95ac1c1f5ab1aaace8d6edd0ba3745b8b8df832f7baa2e7492f7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.4.1"
   infinite_scroll_pagination:
     dependency: "direct main"
     description:
diff --git a/flutter/pubspec.yaml b/flutter/pubspec.yaml
index 010412d..47199b2 100644
--- a/flutter/pubspec.yaml
+++ b/flutter/pubspec.yaml
@@ -2,7 +2,7 @@ name: simplecloudnotifier
 description: "Receive push messages"
 publish_to: 'none'
 
-version: 2.0.1+490
+version: 2.0.1+491
 
 environment:
   sdk: '>=3.2.6 <4.0.0'
@@ -42,6 +42,7 @@ dependencies:
   git_stamp: ^5.10.0
   action_slider: ^0.7.0
   mutex: ^3.1.0
+  in_app_purchase: ^3.2.3
 dependency_overrides:
   font_awesome_flutter:
     path: deps/font_awesome_flutter