Starting with Bundle Patch 220.127.116.11.161018 (Patch 24326201), Oracle Identity Gorvernance or OIM, adds a new REST API for self service requests. The REST Service includes endpoints to invoke self service calls for tasks like Catalog, Requests, Certification, Users, Role, Organization and others. Documentation and examples are available here.
The REST Service has to be installed manually after applying BP 18.104.22.168.161018 by deploying an ear file. The service requires HTTPS with a certificate for authentication. More details can be found in the BP Readme file.