function get_shipment_info($post_id, $shipment_source_data)
 {
     if (empty($post_id)) {
         $wftrackingmsg = 0;
         wp_redirect(admin_url('/post.php?post=' . $post_id . '&action=edit&' . self::TRACKING_MESSAGE_KEY . '=' . $wftrackingmsg));
         exit;
     }
     if ('' == $shipment_source_data['shipping_service']) {
         update_post_meta($post_id, self::SHIPMENT_SOURCE_KEY, $shipment_source_data);
         update_post_meta($post_id, self::SHIPMENT_RESULT_KEY, '');
         $wftrackingmsg = 6;
         wp_redirect(admin_url('/post.php?post=' . $post_id . '&action=edit&' . self::TRACKING_MESSAGE_KEY . '=' . $wftrackingmsg));
         exit;
     }
     update_post_meta($post_id, self::SHIPMENT_SOURCE_KEY, $shipment_source_data);
     try {
         $shipment_result = WfTrackingUtil::get_shipment_result($shipment_source_data);
     } catch (Exception $e) {
         $wftrackingmsg = 0;
         wp_redirect(admin_url('/post.php?post=' . $post_id . '&action=edit&' . self::TRACKING_MESSAGE_KEY . '=' . $wftrackingmsg));
         exit;
     }
     return $shipment_result;
 }
 private function load_tracking_data()
 {
     $this->tracking_data = WfTrackingUtil::load_tracking_data();
 }