Authenticate user(access_token/idToken) that coming from ios app after allowing my app

Authenticate user(access_token/idToken) that coming from ios app after allowing my app.

I just send access_toke or idToken of same user to back end through API.

Back End developer want to authenticate the given token and get the user information via this token.

Save user info and login user, without verifying email bcoz user is already authenticated via goofle oauth.

I have created two client id in google oauth

one for ios app. second for web.

But Backend devoper are not able to authenticate the user that coming from ios after allowing my app.

IOS developer send user_id, access_token, idToken.

But we are not able to authenticate same user with web client id.

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