var request = new sn_ws.RESTMessageV2();

request.setEndpoint('https://devxxxxxx.service-now.com/api/now/tinyurl'); //change that devxxxxx to your instance domain

request.setHttpMethod('POST');

//Eg. UserName="admin", Password="admin" for this code sample.

var user = ‘id’;

var password = 'password’; // you can create a user with no roles also we just need some ServiceNow instance user

var body={};

body.url='https://devxxxx.service-now.com/sys\_user.do?sys\_id=6841a85a2f095110c083d0ccf699b6e8&sysparm\_view=&sysparm\_domain=null&sysparm\_domain\_scope=null'; //url that need to be shortened

request.setBasicAuth(user, password);

request.setRequestHeader("Accept", "application/json");

request.setRequestHeader('Content-Type', 'application/json');

request.setRequestBody(JSON.stringify(body));

var response = request.execute();

gs.info(response.getBody()); // you will get JSON of url