Hi guys, I figure out asking ChatGPT

I haven't add the capability of Background modes on Xcode and miss some listeners on the frontend flutter code. Now I can get push notifications when I am not in the app, and need to better construct the message. For now is just saying notification, even though is a title, but is working. And since the APP is running on flutter, you need to amend the code.

On Xano, I will put a recurrent Task to check pending messages and send using the API call.

The next step will be in-App-notifications. Below the whole script on how to do it:

To ensure your Flutter app running on iOS recognizes and handles FCM push notifications, you need to cover both iOS-specific configuration and Flutter-side message handling.

⚙️ iOS Configuration

Since FCM messages are delivered via Apple Push Notification Service (APNs) on iOS, several steps in your Xcode project and Firebase console are critical:

Enable Capabilities in Xcode:
- Open your Xcode workspace (ios/Runner.xcworkspace).
- Select your project, then your target (usually Runner).
- Go to the Signing & Capabilities tab.
- Click + Capability and add Push Notifications.
- Click + Capability again and add Background Modes.
- Under Background Modes, ensure Background fetch and Remote notifications are checked.
Upload APNs Key to Firebase:
- In the Firebase console, go to Project Settings > Cloud Messaging.
- Under iOS app configuration, upload your APNs Authentication Key (.p8 file) or a Push Notification Certificate (.cer file). You must generate this from your Apple Developer account.
- This links your Firebase project to Apple's push service.
Include GoogleService-Info.plist:
- Ensure the GoogleService-Info.plist file, downloaded from the Firebase console, is correctly placed in your Xcode project's Runner directory.
Handle Rich Notifications (Optional but recommended for image/media):
- If you plan to send notifications with images or other media (rich notifications), you need to set up a Notification Service Extension in Xcode and integrate the Firebase Messaging extension helper.

📱 Flutter Implementation

You must use the firebase_messaging package and define listeners in your Dart code for the different app states:

1. Request Permissions

For iOS, your app must explicitly request user permission to display notifications:

Dart

final settings = await FirebaseMessaging.instance.requestPermission(\n  alert: true,\n  announcement: false,\n  badge: true,\n  carPlay: false,\n  criticalAlert: false,\n  provisional: false,\n  sound: true,\n);\n

2. Handle Message Listeners

You need to set up listeners for messages arriving in the foreground, background, and when a notification is tapped (opening the app from a terminated or background state).

Foreground: Use FirebaseMessaging.onMessage.listen() to handle messages when the app is actively running and visible. Note that on iOS, notification messages received while the app is in the foreground do not automatically display an alert; you'll typically use a package like flutter_local_notifications to display a custom notification/banner.
Dart
```
FirebaseMessaging.onMessage.listen((RemoteMessage message) {\n  print('Got a message whilst in the foreground!');\n  // Manually show local notification here if needed\n});\n
```

Background/Terminated: Define a top-level background message handler function outside of any class to process messages when the app is in the background or terminated. You must register this handler early in your main function.

Dart

// Must be a top-level function (outside any class)\nFuture<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {\n  await Firebase.initializeApp(); // Initialize Firebase if not already\n  print(\"Handling a background message: ${message.messageId}\");\n  // Perform background work here\n}\n\nvoid main() async {\n  WidgetsFlutterBinding.ensureInitialized();\n  await Firebase.initializeApp();\n  // Register the handler\n  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);\n  runApp(MyApp());\n}\n

Notification Tapped (Opening the App): Use FirebaseMessaging.onMessageOpenedApp.listen() to handle when a user taps a notification to open the app (from a background or terminated state).
Dart
```
FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {\n  print('App opened by tapping notification!');\n  // Navigate to a specific screen based on message data\n});\n
```

3. Retrieve Token

Finally, ensure you retrieve and send the FCM registration token to your server, as this is the unique identifier needed to send a notification to a specific device.

Dart

String? token = await FirebaseMessaging.instance.getToken();\nprint(\"FCM Token: $token\");\n

The video Flutter Push Notifications with Firebase Cloud Messaging (FCM) - 2025 provides a detailed, step-by-step guide on setting up Firebase Cloud Messaging in a Flutter app for both foreground and background notifications.

Push Notification Firebase Xano