Hi,
If you are talking about an integration between Mendix and Camunda, there is no standard one but you can use REST API's to connect. Not a camunda expert, but here are the API documentations on the camunda side: https://docs.camunda.org/manual/latest/reference/rest/ and this is how you call a REST service with Mendix: https://docs.mendix.com/refguide/call-rest-action