Sample Flutter Set up

  @override
  void initState() {
    super.initState();
    _initializeFirebaseMessaging();
  }

  /// Initializes Firebase Messaging and retrieves the FCM token.
  Future<void> _initializeFirebaseMessaging() async {
    FirebaseMessaging messaging = FirebaseMessaging.instance;

    await messaging.requestPermission(
      alert: true,
      badge: true,
      sound: true,
      provisional: true,
    );

    // Get the initial FCM token
    String? token = await messaging.getToken();
    _updateFcmToken(token);

    // Handle token refresh
    FirebaseMessaging.instance.onTokenRefresh.listen(_updateFcmToken);
  }

  /// Updates the FCM token and prints it for debugging.
  void _updateFcmToken(String? token) {
    setState(() => _fcmToken = token);
    debugPrint("FCM Token: $_fcmToken");
  }