That's what we try to simplify at Resmo. We integrate with 80+ most popular tools a company might be using. Of course there are some we don't cover yet. Only 3 tools requires paid-tier for API access. Also, we list access Login with Google data from your workspace. We gave a central place for you to list the users and their permissions.
https://resmo.com/saas-discovery
Then you can do `SELECT * FROM users WHERE mail = 'mustafa@resmo.com'`