Create an app that when it is in the background and receives notifications from firebase is shown as the notifications of whatsapp conversations
you have to see that complete rectangle of the notification indicating the text sent from firebase
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i have a well exp on notification system with different style like the "message style" as you shown in the attachment
also I have a well exp on the firebase messaging to respond to messages even if the app in the background
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I have looked into the attached images. If you're talking about the firebase FCM notifications, I can add that to your android app. Let me know if you're interested.