There are various ways of creating or obtaining APIs for use in IBM App Connect.

Create flows for an API

You can create flows for an API (also referred to an API flow) from the App Connect Dashboard.

A flow for an API contains a request, one or more actions for an application or API, optional toolbox nodes for specialized data processing, and a response. The request uses a model that you define to request the creation, replacement, or retrieval of data objects in your applications or APIs. When the request is submitted, each target application or API performs its action, and then the flow returns a response that either confirms that the actions were successful, or returns the data that was requested. You can define multiple flows for an API and then expose these flows as operations that are typically invoked from mobile and web applications.

More information:
Creating flows for an API from scratch or from a template
Managing flows for an API

Add APIs to the App Connect catalog

You can add APIs to the App Connect catalog by importing OpenAPI documents that contain API definitions. All APIs that you import are added to the APIs tab of the App Connect catalog and are tagged with an ‘imported’ label Imported label for APIs.

If using IBM App Connect on IBM Cloud, all APIs that are shared in your IBM Cloud organization using native API management are also automatically added to the APIs tab of the App Connect catalog.

More information:
How to use IBM App Connect with APIs imported from OpenAPI documents
How to use IBM App Connect with shared APIs in IBM Cloud

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