| Аргумент | Возможный тип | Описание |
| $paypal_order_id | — | — |
$qry = $this->db->query("SELECT SUM(`amount`) AS `amount` FROM `" . DB_PREFIX . "paypal_order_transaction` WHERE `paypal_order_id` = '" . (int)$paypal_order_id . "' AND `payment_status` = 'Refunded'");
return $qry->row['amount'];