You can create a published API using either a top-down approach or a bottom-up approach.
Top-down approach
Using the top-down approach, use the REST API page to create an operation for an API and then publish the API. Add the operation details, map an Application Integration process to the operation, and configure operational policies and response timeout. After you create the API, save and publish the API.
To create a published API using the top-down approach, you must be assigned the Designer or Admin role.
For more information about creating and publishing an API using the top-down approach, see Creating an API operation topic in the REST API Assets help.
Bottom-up approach
Using the bottom-up approach, you can create published APIs from existing Application Integration processes.
To create a published API using the bottom-up approach, you must be assigned the Deployer or Admin role.
Use the Services tab in the API Console page to create a published API.
You can create published APIs and subsequent managed APIs for both active and inactive Application Integration processes. However, you can't invoke a managed API of an inactive Application Integration process.
For more information about creating a published using the bottom-down approach, see Creating a published API.