Using Microsoft Bot Framework, how to login to my website from a Slack channel, then comeback to the bot as a connected person ? (Node)

Currently my users are using a Messenger channel. They use linking_account from Messenger, described here: https://blog.vjrantal.net/2016/11/15/facebook-account-linking-with-microsoft-bot-framework/

So when they click on login in the bot, they automatically go to my website, enter credentials, click on login then the window closes and they are back to the bot. It works pretty well.

I am using:

if (session.message.sourceEvent.account_linking) {
   ...
}

To know if there is an account_linking event happening and it works, I can login, but... I don't really know how it works behind. Can I listen to events from Slack or something ?

Finally, how can I achieve the same thing using Slack ?

via Pierre Hofman