Unable to read the data in API

Hi friends, My API has request headers and json request body.I am sending those to request but data is not getting from the API. Request Headers : Application key,x-center,content-type Request Body: {Perpage:10, currentpage:1,fromdate:"2019-08-10,to-date:"2019-10-12"} I tried all the solutions available in the Google but I can't.can any one please help me