Does KEPServerEx have an API available?
//Edit//
Assuming it’s a rest service, take a look at these docs and learning paths.
https://docs.mendix.com/refguide/call-rest-action
https://docs.mendix.com/howto/integration/consume-a-rest-service
https://academy.mendix.com/link/modules/138/lectures/1226/5.1-Consume-a-REST-Service