Helpers for getting an OAuth 2.0 token.
See https://developers.google.com/identity/protocols/OAuth2WebServer

Reference for receiving a token in a redirect from the oauth provider.
If you are making a web app, implement a route in your app that captures the code parameter.
If you use this namespace, add ring as a dependency in your project.

Reference for how to manage credentials.
For a web app, you should implement something like this but use your database for credential storage.
secret, scopes, fetch, save have default implementations that you can replace with init!