I am currently able to pull list of contacts and specific contacts successfully through the API; but am having an odd issue when creating a contact.

I get a 200 OK response but the returned JSON does not return expected fields such as "FirstName" and "LastName", it isntead lists "RequestID" and "RequestURL".

I don't see any documentation about such fields; can anyone point me in the right direction of what to do with these fields or what they are for? I've attached a screenshot of the JSON response I am receiving.