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I am trying to implemenent some kind of logging for incoming message from FCM. We are using FCM display(notification) messages type. I am trying to find way to log incomming notification when application is in background. I am aware of that if I would be using FCM Data message type I can simple receive notificaiton in onMessageReceived callback from FirebaseMessagingService but unfortunately that's not possible.

Jan Maděra
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it works in background if the fcm payload formed with data message. the notification message will just show message in system tray [app has no access of that message].

Rushit Vaishnani
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    So there's no way to implement some kind of middleware between receving a showing notificaion? For example iOS can use https://developer.apple.com/documentation/usernotifications/unnotificationserviceextension ? – Jan Maděra Nov 11 '20 at 13:40