New creates a new Discord provider, and sets up important connection details.

for oauth2 bots, this puts the bot in the user's selected guild by default.

allows /users/@me/connections to return linked Twitch and YouTube accounts.

enables /users/@me to return an email.

allows your app to join users to a group dm.

allows /users/@me/guilds to return basic information about all of a user's guilds.

allows /users/@me without email.

allows /invites/{invite.id} to be used for joining a user's guild.

this generates a webhook that is returned in the oauth token response for authorization code grants.

Provider is the implementation of `goth.Provider` for accessing Discord.

Session stores data during the auth process with Discord.