Registration section

Developers that can access the developer portal can create applications that are then registered to consume any given API they have been granted access to. When an application is registered to a given API, an application-key is provided. Presence of the application-key when calling an API can then be enforced by using the Key Validation policy.

From this page, registrations to the API can be created, approved, rejected, or suspended:

API implementation page–registration section