Swagger Is Supported in External Services (Beta)

If you checked out External Services, you know that you can use the Interagent hyper-schema in your service. Now External Services supports Swagger / Open API 2.0 as well. In addition, mapping now occurs for all definitions, including ones with error messages. Previously, a response had to match the response in the schema provided. This change applies to Lightning Experience only.
Available in: Enterprise, Performance, Unlimited, and Developer Editions