POST request with webmethods

i am using platform 10.1 and i developed a service that is supposed to receive data as Post request.
when i try to run it on IDE it works fine, but when i publish it and try to access it through API Portal, it does not work.
i am not sure how to map my JSON to my Document. Can anyone please guide me in this regard?

I have attached my Document screen shot as well as the json i am trying to Post.
i am stuck in this issue since yesterday, it would be great if anyone can share a guide about transforming Documents to JSON

I am not be able to find the attached document and the JSON. have you attached it?

yes i have, let me attach again

i dont know why its not letting me attach again
you can look here as well