To implement an API gateway for Oracle Integration, perform the following steps:

1. Configure an API gateway according to your organization's requirements. See Creating API Gateways and Resources.
2. Add your organization's VCN OCID to the Oracle Integration allowlist. This allows your VCN to bypass the API gateway. See Configure an Allowlist for Your Instance.
3. Add your API gateway's VCN to the Oracle Integration allowlist. This allows the API gateway to pass through calls from APIs deployed in the gateway's VCN to Oracle Integration.
4. Enable loopback in the Oracle Integration allowlist so that Oracle Integration can call itself.

   For example, enabling loopback allows Oracle Integration to call its own REST APIs.

5. Deploy APIs to your gateway. See Creating API Gateways and Resources and Deploy Integration Endpoints to Oracle Cloud Infrastructure API Gateway.