It's in your control room's Swagger page.

https://yourcontrolroom/swagger/

Don't forget the last slash. 

By the way, it does not work for Community Edition. You must be using the Enterprise Edition for the execute automation REST call.

​@bosserror here’s a link to our docs website you may find useful: https://docs.automationanywhere.com/bundle/enterprise-v2019/page/enterprise-cloud/topics/control-room/control-room-api/cloud-control-room-apis.html