For security reasons it is advisable to create your own backend to handle the communication to the API's to avoid sending OAuth tokens to differetn third-party services. The part that I'm not sure about would be how to set up IFTTT to work with multiple Slack token and multiple Google auth tokens.

There are a multitude of ways you could store the OAuth tokens and link them together, as long as it's secure! Because of the nature of OAuth you need to have a UI to redirect users to the right place and to collect OAuth request/access tokens etc. Either way you do it, you need to have a single OAuth app approved by Google and a single Slack app approved by Slack too.

Full disclosure, I own one such service, but I won't mention it to avoid polluting this comment (you can look at my post history to find it if you're interested).īack on topic! The main things to do are to allow customers to somehow sync their slack account and a google account.

Nice work! When it comes to syncing Google Calendars and/or Outlook there are a few services out there that already exist.

Slackstatus