- Open Firebase console. If you have no Firebase account, create one using your Gmail account and refer to the Registering App in Firebase article for the next steps.
 - Open the app project, click the Settings button, and select Project settings.

 - Go to the General tab and scroll down to the Your apps section. There, locate the required app and click google-services.json to download the file.

 - Add the google-services.json file to the root of the app directory of your app in Android Studio.

 
Downloading google-services.json File from Firebase
3 February 2022