/**
* Import refund results to payment
*
* @param \Magento\Paypal\Model\Api\Nvp $api
* @param \Magento\Sales\Model\Order\Payment $payment
* @param bool $canRefundMore
* @return void
*/
protected function _importRefundResultToPayment($api, $payment, $canRefundMore)
{
$payment->setTransactionId($api->getRefundTransactionId())->setIsTransactionClosed(1)->setShouldCloseParentTransaction(!$canRefundMore);
$this->importPaymentInfo($api, $payment);
}