Have you taken a look at the Connect Rest rule?  If not that is where you need to start.

Sincerely,

Cecil Howell, CSA |  Senior Instructor  |  Pegasystems Inc.

Thanks!

For the time being, I am parsing the Reponse page to json using the Public API, and sending the response in the form of an out Param. In the Service-Rest rule, I am mapping the Response to output Parameter of the activity.

Also, since the requirement is to create a Service-Rest rule, I am unable to use the out-of-box connect -rest functionality.

Regards,

Harshal

I am also looking for the same answer. trying to create a case exposed through a REST service. If i return the svcOutput page as an XML stream, it works but not as a JSON message. I get a mapping error. 

What error do you get Saurabh?

I get authentication error when i try to access the endpoint from soap ui, but i get the correct json mapping when i try to access from service in pega.