Cloud Workflow - PATCH method call within Service Task issue

[RoryA]

When attempting to call the PATCH method within a service task, I get a 503 - Service Unavailable" but have no issue calling it from Postman. Not sure if its a XSRF issue or not but Im doing a GET call to the same URL just prior that is successful, hoping that it loads the XSRF token. Looking for a solution.

Thanks

Rory

[RoryA]

Thanks Tobias -

Yes scenario 2 is my goal. I was able to successfully execute the API using a Sub Workflow task.