You can find implementations of every available endpoint in /app/authlink.server.js, although only a few are used in this app.
You will need the following keys in your .env file, the values of which can all be found, generated, or set on your application's page: CLIENT_ID, CLIENT_SECRET, & REDIRECT_URI. Auth scopes are a constant of identify and servers.
For storing sessions persistently, you will also need to specify COOKIE_SECRET and SESSION_STORAGE_PATH.