PIN is verified but not used currently. Works a little different than
the others, you input your matrix user ID and then the PIN is sent to
you. The bot doesn't support E2EE, so the bot being the first one to
message ensures the chat is unencrypted.
Discord, Email & Telegram can be enabled, although email is always
enabled right now (will fix). Also apparently markdown hyperlinks don't
work in Discord, eventually will implement something to convert them to
embeds.