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@ResponseBody
public String paymentFeedback(@RequestBody MultiValueMap<String, String> requestParameters, @RequestBody String requestBody) {
    boolean isValidRequest = myService.hasRequestValidSHASign(requestParameters);
    if (isValidRequest) {
        String voucherNumber = findParameter(requestParameters, ORDERID_PARAMETER);
        if (!StringUtils.isEmpty(voucherNumber)) {
            Order order = orderService.getOrderByVoucherNumber(voucherNumber);
            if (order != null) {
                String status = findParameter(requestParameters, STATUS_PARAMETER);
                if (ACCEPT_STATUS_VALUES.contains(status)) {
                    updateOrderWithPaymentStatus(order, Status.PAID, requestParameters);
                    orderService.sendEmail(order);
                    orderService.sell(order);
                } else if (CANCELLED_STATUS_VALUE.equals(status)) {
                    updateOrderWithPaymentStatus(order, Status.CANCELLED, requestParameters);
                } else if (DECLINE_STATUS_VALUES.contains(status)) {
                    updateOrderWithPaymentStatus(order, Status.DECLINED, requestParameters);
                } else if (EXCEPTION_STATUS_VALUES.contains(status)) {
                    updateOrderWithPaymentStatus(order, Status.EXCEPTION, requestParameters);
                } else {
                    logger.warn("Order ID={} got strange status: {}. Ignoring that feedback...", voucherNumber, status);
                }
            } else {
                throw new IllegalArgumentException("Can't find voucher with orderID from feedback: " + voucherNumber);
            }
        } else {
            throw new IllegalArgumentException("Received feedback with missing orderID: " + requestBody);
        }
    } else {
        throw new IllegalArgumentException("Received feedback with invalid SHA sign: " + requestBody);
    }
    
    return "";
}