Message notification is not impacted here. You don't need to open the full app for that to happen. If the app uses encrypted messages, you just have to write a

Message notification is not impacted here. You don't need to open the full app for that to happen. If the app uses encrypted messages, you just have to write an extension to handle the decryption on device while the app is not running. If the user wants to interact further after reading the message notification, they open the full app.