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

When your app authenticates with a backend server or accesses Google APIs from your backend server, then you must pass the OAuth 2.0 client ID that was created for your server to the requestIdToken method when you construct the GoogleSignInOptions object, for accessing the user's basic profile information. Also, don't forget to submit the support email in the OAuth consent screen found in the Credentials page in the API Console.