/**
  * Adds shipping information to the request
  *
  * @since 3.0
  */
 private function add_shipping()
 {
     // <shipping>
     $this->startElement('shipping');
     // <amount>
     $this->writeElement('amount', number_format(SV_WC_Plugin_Compatibility::get_total_shipping($this->order), 2, '.', ''));
     // <name>
     $this->writeElement('name', __('Shipping', WC_Authorize_Net_AIM::TEXT_DOMAIN));
     // <description>
     $this->writeElement('description', substr($this->order->get_shipping_method(), 0, 255));
     // </shipping>
     $this->endElement();
 }