code: public function getMessage()
      {
          $response = [];
  
          if ($messages = $this->data->query('/Message/Body/Errors')->array()) {
              foreach ($messages as $message) {
                  $response[] = $message->textContent;
              }
          }
  
          return count($response) ? implode(', ', $response) : null;
      }
docs: Text description of the status.
  
  @return string|null