Reverse Multipass. "Login with shopify"

Hello everyone, I have an app where, before I let the user do anything in there, I need to guarantee he is a registered user on my shopify store. I’ve read the docs and the forum and didn’t find anything that would solve this problem.

The closest solution I saw was Multipass, which lets a user login on my app and then be redirected to my shopify store, already logged. I basically need this feature but the other way around:

  1. The user comes to my website
  2. If he doesn’t have a valid shopify token he gets redirect to shopify
  3. The user logins there and gets redirected to my app with the token
  4. Now I can let him use our API

Pretty much how a login with Steam would work.

Any idea?

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