SDP API VBA script "input_data" format

Hi,

I've been banging my head against the wall for a few days now trying to get a VBA script to add a new request with a certain template. I keep getting below error:

{"response_status":{"status_code":4000,"messages":[{"status_code":4001,"field":"input_data","type":"failed","message":"Value not provided"}],"status":"failed"}}

If anyone could give me an example how to build the httprequest in VBA, it would be greatly appreciated. Below is what I currently have:

Public Sub httpclient()

Dim xmlhttp As New MSXML2.XMLHTTP60, myurl As String, inputData As String

myurl = "https://test.com:8080/api/v3/requests"

xmlhttp.Open "POST", myurl, False

xmlhttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"

xmlhttp.setRequestHeader "authtoken", "########-####-####-####-############"

inputData = "{input_data:{""request"":{" _

& """subject"":""Onboard Lord Sauron""," _

& """description"":""Please give Lord Sauron all necessary permissions to forge the ring""," _

& """requester"":{""id"":1}," _

& """status"":{" _