class Refund
{
    /**
     * Settlement module
     *
     * @var LinePay
     */
    private $module;

    /**
     * Inject `LinePay` module
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param LinePay $module
     */
    public function __construct(LinePay $module) {
        $this->module = $module;
    }

    /**
     * Refund a transaction
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $args
     * @return array
     */
    public function refund(array $args) {
        $orderId = (int)$args['orderId'];
        $ometa = new OrderMeta($orderId);

        $this->module->api->adminreq = true;
        $res = $this->module->api->refund($ometa->getTransactionId());
        if ($res instanceof GenericError) {
            return $res;
        }

        $ometa->setTransactionState(new TransactionState($ometa->getTransactionId(), TransactionState::REFUNDED));

        return $res;
    }
}