Customer has requested that visibility over and ability to sign up to specific APIs be able to be restricted by user group - similar to current group-based feature visibility.

Let's assume, API Provider has 6 APIs (a,b,c,d,e,f).
And there are 3 types of consumers.
Let's say Internal User, external user, and secure user.
If the API provider wants the consumers should be able to access like below:
Internal Users can access all the APIs.
external user can access only c,d,e,f APIs.
And secure user can access only f and f APIs. 

As per the above example, external user shouldn't see the APIs a and b.
And all the configuration can be done from the Admin portal.
And the user category can be taken during sign-up.