Braintree\TransactionGateway::refund PHP Метод

    public function refund($transactionId, $amount_or_options = null)
    {
        self::_validateId($transactionId);
        if (gettype($amount_or_options) == "array") {
            $options = $amount_or_options;
        } else {
            $options = ["amount" => $amount_or_options];
        }
        Util::verifyKeys(self::refundSignature(), $options);
        $params = ['transaction' => $options];
        $path = $this->_config->merchantPath() . '/transactions/' . $transactionId . '/refund';
        $response = $this->_http->post($path, $params);
        return $this->_verifyGatewayResponse($response);
    }