I have published a process model as a web service. I have made two variables as

As you can read in the documentation only the process ID is returned. This is by design. To return values you have to implement some kind of callback like a webservice running on the 3rd party system that can be called by the Appian process.

Hi Stefan, Thank you for the reply. If we cannot return any useful output(other than process id) from the process model which is published as a web service, a natural question arises - What useful is this functionality of publishing the process model as a web service then? If we can just start a process model and only get its process id via a web service call, then it is not much useful. A webservice is expected to return some useful result. So, a process model published as a web service should also return a useful result.

First thinking about that, I would agree to you. But, when you call a webservice you want a result back within a predictable amount of time. The timing of process execution is not predictable in this sense. So Appian returns you the process ID within a defined amount of time. Your process can run for seconds or years and return its results as a callback as it completes. The other system has the process ID and can wait for the results.

Hi Stefan, That does make sense. Thank you.