requestPermission function

Implementation

void requestPermission() async {
  FirebaseMessaging messaging = FirebaseMessaging.instance;
  if (Platform.isIOS) {
    await messaging.requestPermission(
      alert: true,
      badge: true,
      sound: true,
    );
  }
  NotificationSettings settings = await messaging.requestPermission(
    alert: true,
    badge: true,
    sound: true,
  );

  if (settings.authorizationStatus == AuthorizationStatus.authorized) {
    debugPrint("User granted permission");
  } else {
    debugPrint("User declined or has not accepted permission");
  }

}