Call 3rd party API from nintex work flow 2016

HI 

Am new to the nintex work flow I need to call an REST api to insert list data to oracle db. Currently we have this API calling from a PHP application where we are sending data as jason format . 

How can call this api and send data in json format from web request.

API URL: http://IPAddress:7776/jderest/v2/orchestrator/ORCH_CustPortal_CreateAB

User ID:

Password:

Environment: JPY920

Role: *ALL

Eg Json: 

{

               "User ID":"vb2862",

               "Trans Type":"JDEAB",

               "Dir Ind":"1",

               "Tr Ac":"A"

}