Flutter FCM Push notification Open rate always at Zero - flutter

I have Implemented FCM Push notification successfully using firebase_messaging 6.0.16. Device is getting Notification but Open rate in Firebase is always at zero even if notification is Opened. Is there any specific feature needs to be enabled.

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Flutter Notification appears twice when app is in background

I am using firebase and flutter_local_notifications package to show the notifications sent from api (laravel) and when app is closed (background mode) the notification is repeated but in foreground it appears once
This is my code
https://github.com/KamlaSaad/Notification/blob/main/not
There are two types of messages: notification and data.
Notification messages are handled by the FCM SDK automatically. Most likely the first one comes from SDK and the second one from your handler.
Notification messages which arrive in the foreground are not handled by the SDK.
See Message types for details.

After calling deleteToken (FCM) iOS app receiving notification

After calling deleteToken() android not receiving any notification. but iOS app still receiving.
Any other way to avoid receiving notification when user opt-out (from app itself), and allow to receive notification after opt-in ?
Note: not using topic concept

How to send push notification from pusher channels?

I have initialized pusher_channels_flutter, and works.
How to watch pusher changes to send a push notification to watch changes in the background (when the app is closed).
The layout of the notification is minimalist, app logo + custom text from the pusher. For both mobile platforms!
Like:
Have a flutter_local_notifications possibly to send notifications in the background?
This is my first time doing this, I need some advice.
Have a nice day.

flutter local notification display only the last notification in tray

in my flutter project, I used FCM to push notifications and flutter_local_notification to display the received notifications
and I used the "data" payload to read the notification in my app.
and it works fine, but when I send more than one notification only the last one appears in the device tray (For both ios & android).
it seems like the application received only one notification
anything to do so multi notifications could be shown in the tray

Push Notification not coming on device from server through APNS to device

What are the reasons,that push notification is not coming on my device
when my app is not running
If you implement application:didFinishLaunchingWithOptions: to handle an incoming push notification that causes the launch of the application, this method (application:didReceiveRemoteNotification) is not invoked for that push notification.
Cf Apple Online Doc