For 3rd party integration we need permanent URL to start a process, that may include simple http requests as well as starting a business process. I understand that the only way to retrieve the URL is to pick it from a workflow GUI - even when this specific start should not be published :-( .
The question is: is that URL permanent, i. e. does it depend on a process model or on a process model version. From our point of view, we need an URL that starts the current version in "release" state.