(web.config - replace values with ones received from Tatrabanka)

<add key="CardPay:Mid" value="9999" />
<add key="CardPay:HexEncryptKey" value="1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D1A2B3C4D" />
<add key="CardPay:FormActionUrl" value="https://moja.tatrabanka.sk/cgi-bin/e-commerce/start/cardpay" />

// initialize your.cs file
TbCardPay cardPay = TbCardPay.CreateRequest(132.15,
                                            TbCardPay.Currency.EUR,
                                            1234567890, 
                                            "http://my.eshop.com/CardPayReturnAddress", 
                                            "123.123.123.123", 
                                            "Jan Pal");
                                            
                                            
<!-- your view or html file - assume that 'cardPay' is inicialized TbCardPay instance, see above -->
<form action="@cardPay.FormActionUrl" method="post">
    @Html.Raw(cardPay.HtmlHiddenFields())
    
    <button type="submit">Pay</button>
</form>

// MVC example
public virtual ActionResult CardPayResponse(string amt, string curr, int vs, string res, string ac, string tid, string timestamp, string hmac)
{
    if (false == TbCardPay.CheckBankResponse(amt, curr, vs, res, ac, tid, timestamp, hmac))
    {
        // SIGN from bank is NOT valid - log this error and exit
        return new HttpNotFoundResult();
    }

    if (res == "OK")
    {
        // ... payment was OK, you can pair your payments using "vs" parameter
    } else {
        // ... payment has failed (maybe credit card was expired)
    }
}

TbCardPay.SelfTest();

TbCardPay.SelfTest();