Google Sign In error 12500

Question

I am trying to integrate Google Sign In into my app. I don\'t have a back-end server, I am just getting the details of the logged on Google Account to my app.

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Answer 1

First make sure you registered your app in the google developers console

Make sure you have both the debug and release keys in your Firebase application. If it this error appears in production, add your SHA-1 release key to fire base app. If it appears in development, then add your SHA-1 debug key.

Getting the debug/release key:

keytool -exportcert -list -v -alias [your alias] -keystore [path/to/debug or release.keystore]

Make sure to download the updated google-services.json to your app.