Paranoia\Payment\Adapter\Posnet::buildRefundRequest PHP Method

    protected function buildRefundRequest(Request $request)
    {
        $amount = $this->formatAmount($request->getAmount());
        $currency = $this->formatCurrency($request->getCurrency());
        $type = $this->getProviderTransactionType(self::TRANSACTION_TYPE_REFUND);
        $requestData = array($type => array('hostLogKey' => $request->getTransactionId(), 'amount' => $amount, 'currencyCode' => $currency));
        return $requestData;
    }