{
"Result": {
    "Message": "",
    "MessageDetails": "",
    "Status": 1
},
"SessionGuid": "*********"
}

var result = HTTP.Post(url, contentType, payload);
   var accessToken = Platform.Function.ParseJSON(result);
  var SessionGuid = accessToken.SessionGuid;
  write(SessionGuid);
 // var oResults = eval("(" + result[0] + ")");
 //  var sessionid = Results["SessionGuid"];
 //  var obj = Platform.Function.ParseJSON(result);
 // var  sessionid = result.SessionGuid;
 // var obj = Platform.Function.ParseJSON(results);
 // write(sessionid);
 //var oresults = Stringify(result);
 //   Write(oresults);
 // var resultss = results["StatusCode"];
 // var sessionid = results.StatusCode;
 // Platform.Function.InsertDE("broker",["Response"],[sessionid]);

var result = HTTP.Post(url, contentType, payload);
var tokenResponse = Platform.Function.ParseJSON(result.Response[0]);
  var accessToken = tokenResponse.SessionGuid;
    Write(accessToken);