Configure FCM for Android

From your firebase admin please click Add Firebase to your Android app like this picture :

Then you need to fill :

1.Package name –>

This package name must be same with applicationId at app/build.gradle , and package name must be unique, because it will used for playstore id. In example we use “app.koran”

2.Debug signing certificate SHA-1 (optional) –> You can let this empty

Last, you need to placed configuration file google-services.json into your app folder