Google Sign In
https://developers.google.com/identity/sign-in/web/sign-in
This has a link to the management console.
Frontend Setup
<!-- Load Library -->
<script src="https://apis.google.com/js/platform.js" async defer></script>
<!-- Specify Client ID-->
<meta name="google-signin-client_id" content="YOUR_CLIENT_ID.apps.googleusercontent.com">