/**
  * This function gets the URL to the user authenticate the application in ML.
  *
  * @return string
  **/
 public function get_login_url()
 {
     if (is_null($this->meli)) {
         return '';
     }
     return $this->meli->getAuthUrl(WooCommerce_MercadoLivre::get_admin_settings_page_url());
 }