Generate unique membership key for API check

Hey guys,

is it possible to generate a unique membership key (API key) for each signed up user with the Membership plugin?

Similar how you do it here on WPMUdev. I need a licensing system to call back and verify if the user purchased a specific plugin. I guess the best way would be a generated membership key.

Would be great if you can help me out or some existing plugins I can use.

Thanks a lot