The APIs page of the project editor lists the definitions of APIs (web services) added to your project. You use the page to view, add, or delete definitions:
Click the image to enlarge it.
To add an API
Click 
on the toolbar and, in the subsequent dialog, select the definition type and location:
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The dialog has the following tabs:
Use this tab to add an API from a definition file: WADL, Swagger/OpenAPI, WSDL, or GraphQL.
Use this tab to add a REST API by using the URLs of its resources.
Use this tab to record requests while you are working with the service.
To learn more, see Adding More APIs to Existing Projects.
To delete an API
To delete an API, select it and click 
.