API Authentication in JS

API
11

I think I did indeed do everything according to your replies and the doc but still only receive data=[]

var XML = new XMLHttpRequest();
            var response = null;
            
            XML.open("GET", "https://api.twitch.tv/helix/streams/?user_login=sugarincubes");
            XML.setRequestHeader('Client-ID', '<clientID>');
            XML.send();
            XML.onload = function () {
              response = JSON.parse(XML.response);
              console.log(response);
            }