What should I pass in the body of a Process Post request?

Hello all,

Newish to Appian. I am trying to pass inputs to the Process Post Request API and am getting "null" as a return and the process does not start correctly. I am assuming this is due to my process containing a pv of a CDT rather than separate fields. 

My question is: does the request body change per api, what should I pass, and is it possible to merge both get and pull requests into one api?

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