/**
  * Add the value of the trialPeriod property to the order data which is to be included in the $submission_data.
  *
  * @param array $feed The feed currently being processed.
  * @param array $form The form currently being processed.
  * @param array $entry The entry currently being processed.
  *
  * @return array
  */
 public function get_order_data($feed, $form, $entry)
 {
     $order_data = parent::get_order_data($feed, $form, $entry);
     $order_data['trial'] = rgars($feed, 'meta/trialPeriod');
     return $order_data;
 }