Unable to get process key from postman


I am connected robot to orchestrator and publish my script in orchestrator as with name ‘test_2’.

Now i have to run that script using postman.i got access key via post method but when i am trying for process key of my process request is establishing but not sending me process key and even count is showing as 0.
i wanted to run my process using postman using orchestrator API as per requirement.
kindly help me with the same.
Not able to understand what mistake i am doing while fetching process key.
here is the pic of my process in orchestrator and postman .

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