- Multiple API Developer portals (or sites) connected to a single gateway cluster.
- Entirely distinct look / feel and functionality on externally exposed portals for different subsidiaries.
- One single API gateway that holds all the APIs and exposes some on only one portal and some on both/all portals.
- Separation of user permissions, but not necessarily entirely separate user stores. Perhaps you just need to have the option of separate user permissions on each portal. When a user registers on one portal they have certain permissions for APIs, this may or may not mean that they now have an account on the other portals.
I am the Product Manager for the CA API Developer Portal. If you have additional use cases, feel free to mention me in your comment by using @gtellez or email me at firstname.lastname@example.org.