External Start workflow to support response content

adding more details to the idea... basically this turns a Nintex Workflow Cloud into a RESTful Web Service method. It will be a challenge as a workflow might take days to be completed especially if it handles pending stage such as waiting for someone to approve a task.

As such, setting criteria for this idea to work is critical. E.g. only if the workflow has no wait/pending stage/action(s) involved, or else it will return message such as "immediate response not supported".

Expected return of value(s)/response could be identify by the "Output" variable as it supports today.

I have another idea shared “Capture of Request Content in workflow variable” https://nintex.uservoice.com/forums/430063-5-nintex-workflow-cloud/suggestions/19736107-capture-of-request-content-in-workflow-variable
This idea allows a workflow in Nintex Workflow to capture the request content/body, if this idea is supported, we can make Nintex Workflow Cloud’s workflow as a “callbackurl” once a workflow responded to this workflow, the final workflow can do something such as update external system with the initiated workflow’s result.