1. You should add this listener to your app's `main` function but _before_ `runApp` and `Amplify.configure` to avoid missing events.
2. The listener function added should be a [top-level global](https://dart.dev/language/functions#lexical-scope) or [static method](https://dart.dev/language/classes#static-methods) so that it can be invoked even when the app is terminated.
3. Notifications received in a terminated state will be considered low priority by Android unless you increase the priority of the payload by setting the `priority` to `high` (you will need to create a _Raw Message_ in Amazon Pinpoint to set this priority).

```dart
// Example main.dart

// Note: This handler does not *need* to be async, but it can be!
Future<void> myAsyncNotificationReceivedHandler(
    PushNotificationMessage notification) async {
  // Process the received push notification message in the background
}

void main() {
  // Needed to enable background API in the killed state.
  WidgetsFlutterBinding.ensureInitialized();

  final authPlugin = AmplifyAuthCognito();
  final notificationsPlugin = AmplifyPushNotificationsPinpoint();

  // Should be added in the main function to avoid missing events.
  notificationsPlugin.onNotificationReceivedInBackground(
    myAsyncNotificationReceivedHandler
  );

  await Amplify.addPlugins([authPlugin, notificationsPlugin]);
  if (!Amplify.isConfigured) {
      await Amplify.configure(amplifyconfig);
  }

  runApp(const MyApp());
}
```