Overview
Integration Cloud allows you to write integration logic to integrate different types of applications. This logic can be exposed to the external world using REST APIs.
These REST APIs can be created by using an existing set of Integrations (from scratch) or by using a file containing the Open API specification (formerly known as the Swagger specification) as a template.
A REST API consists of many Resource Operations and each Resource Operation has a Path, one or more HTTP Methods, and an associated Integration.
A REST Resource Operation can be tried out from the Swagger screen of a REST API. When the Resource Operation is invoked using the HTTP Method, the associated Integration gets executed.
Note:
Users who have the required project permissions under
Settings 
> Project Permissions can create, update, delete, and execute REST APIs.
Note:
If you have created a REST API by using a file containing the Open API specification (formerly known as the Swagger specification) as a template (Build with Swagger approach), and have now uploaded a new file, Integrations and Document Types that are created are now based on the new Swagger file.