handle to the application opened via notification?

[yakupbaser]

how can i handle this? i started foreground service. And i terminated the app with sliding sideways. (app is still running in memory). When i clicked to notification, the app is openning. But how do I know if I opened the application via notification?

i need to learn that the app opened first or opened via notification. So i need two answers as like that messages:

the app says: I opened for the first time.
or
the app says: im coming from notification tapped, I was already working in background before.

[yakupbaser]

i need that in notification of flutter_foreground_service_plugin:

Future selectNotification(String payload) async {
if (payload != null) {
debugPrint('notification payload: $payload');
}
await Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondScreen(payload)),
);
}