Authentication and authorization in Oracle Integration is managed by Oracle Identity Cloud Service. Oracle Integration REST APIs as well as REST endpoints exposed in integrations are protected using the OAuth token-based authentication. OAuth is an authorization framework that enables an application or service to obtain limited access to a protected HTTP resource.
To use REST APIs with OAuth in Oracle Integration, you need to register your Oracle Integration instance as a trusted application in Oracle Identity Cloud Service. See Security, Authentication, and Authorization in REST API for Oracle Integration.