Looks like you are using the old API 

Have you checked https://developers.freshdesk.com/api/#create_ticket ? 
Looks like the github are 11 year old. 

Thanks  for your guide. that worked but Im getting 401 Authentication required error now. 

This is my code 

function createTicket(e) {

  var API_KEY='My API ';

  var ENDPOINT = 'My domain'; // change to https if SSL is configured.

  var headers = {
    'Content-type': 'application/json',
    'Authorization': 'Basic ' + Utilities.base64Encode(API_KEY + ':X')
  };


  var payload = '{"helpdesk_ticket":{"description":"Description ...","subject":"Title","email":"user@test.com","priority":1,"status":2},"cc_emails":"example1@example.com"}';



  var url = ENDPOINT + '/api/v2/tickets';

  var options = {
    'method': 'post',
    'headers': headers,
    'payload': payload,
    muteHttpExceptions: true
  };

  var response = UrlFetchApp.fetch(url, options);

  Logger.log("code: " + response.getResponseCode());
  Logger.log("text: " + response.getContentText());
}

Hmm, where did my post go ? Oh well. 

401 you need to look at the API key and 'Authorization': 'Basic ' + Utilities.base64Encode(API_KEY + ':X')

401 Authentication required error now. That’s what I get.

All resolved the issue was my domain url was wrong.

Thanks anyway