CLI Auth0: https://www.altostra.com/blog/cli-authentication-with-auth0
Google OAuth Flow: https://developers.google.com/identity/protocols/oauth2/native-app
Client secret leak: https://security.stackexchange.com/questions/138816/what-is-the-worst-that-can-happen-if-your-oauth-client-secret-is-leaked
https://stackoverflow.com/questions/7130648/get-user-info-via-google-api
In this context: https://developers.google.com/identity/protocols/oauth2