Join the DZone community and get the full member experience. Join For Free If users have not installed GMS on their phones, they cannot directly sign in to your app using a Google account. In this case, you can let them sign in to your app in web mode by obtaining the access token for sign-in authentication from Google. The procedure is as follows: Sign in to the Google Play Console, click Credentials, and create an OAuth 2.0 client ID with the Type set to Web application.