1. Go to firebase console and create a new project enter your Business/Project name.

2. Go to FirebaseAuthentication then Click on Sign-in method

3. Enable Google & Anonymous Provider.

Please Download & follow Video tutorials :-

Google Firebase Setup

Copy the CMD linekeytool -list -v -alias androiddebugkey -keystore %USERPROFILE%\.android\debug.keystore (if required password then password is:- android )Then Hit Enter

Now copy both SHA1: & SHA256: Certificate fingerprints. add go to firebase app project settings and add Fingerprints.

Add 2 certificate for each APP.(user app one is admin app) Total Certificate will be 2+2 = 4

Follow For both Admin & User app. (is Important)