Java

Adyen HMAC Signature Calculation for Hosted Payment Pages

See more Adyen Examples

Demonstrates how to do the HMAC Signature Calculation for a hosted payment page (HPP) in Adyen.

For a C# ASP.NET Razor Pages example showing the HTML Form with HMAC signature code, see Adyen HMAC Signature Calculation in C#

Chilkat2 Java

import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.Gzip;
import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.Xml;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        String strHtml = "<table class=\"od\"><tr><th>Description</th><th>Quantity</th><th>Amount</th></tr><tr><td>1 Digital Camera</td><td class=\"r\">1</td><td class=\"r\">100 GBP</td></tr><tr><td class=\"b\">Total</td><td class=\"r\"></td><td class=\"b r\">100.00 GBP</td></tr></table>";

        Gzip gzip = new Gzip();
        String gzOrderData = gzip.compressStringENC(strHtml, "utf-8", "base64");

        Xml xml = new Xml();
        xml.setTag("keyValuePairs");

        xml.newChild2("orderData", gzOrderData);

        // required, The payment deadline; the payment needs to occur within the specified time value.
        String sessionValidity = "2019-08-11T10:30:00Z";
        xml.newChild2("sessionValidity", sessionValidity);

        // optional.  Normally we'll let Adyen automatically know the country based on the IP address.
        // By default, the payment methods offered to a shopper are filtered based on the country the shopper's IP address is mapped to.
        // In this way, shoppers are not offered payment methods that are not available in the country they are carrying out the transaction from.
        // This IP-to-country mapping is not 100% accurate, so if you have already established the country of the shopper, you can set it explicitly
        // in the countryCode parameter.
        String countryCode = "GB";
        xml.newChild2("countryCode", countryCode);

        // optional
        String shopperLocale = "en_GB";
        // If not specified, the locale preference is set to en_GB   by default.
        // When it is not necessary to include the country-specific part, use only the language code.
        // For example: it instead of it_IT to set the locale preferences to Italian.
        xml.newChild2("shopperLocale", shopperLocale);

        // required, A reference to uniquely identify the payment. This reference is used in all communication with you about the payment status.
        // We recommend using a unique value per payment; however, it is not a requirement. If you need to provide multiple references for a transaction,
        // you can enter them in this field. Separate each reference value with a hyphen character ("-"). This field has a length restriction:
        // you can enter max. 80 characters.
        String merchantReference = "paymentTest1234";
        xml.newChild2("merchantReference", merchantReference);

        // required, The merchant account identifier you want to process the (transaction) request with.
        String merchantAccount = "ChilkatSoftwareIncCOM";
        xml.newChild2("merchantAccount", merchantAccount);

        // required.  10000 for $100.00
        String paymentAmount = "10000";
        xml.newChild2("paymentAmount", paymentAmount);

        // required, The three-character ISO currency code
        String currencyCode = "GBP";
        xml.newChild2("currencyCode", currencyCode);

        // required.
        String skinCode = "S7uWsvfB";
        xml.newChild2("skinCode", skinCode);

        // optional, A unique identifier for the shopper, for example, a customer ID.
        // We recommend providing this information, as it is used in velocity fraud checks. It is also the key in recurring payments.
        // This field is mandatory in recurring payments.
        String shopperReference = "somebody@example.com";
        xml.newChild2("shopperReference", shopperReference);

        // optional
        String shopperEmail = "somebody@example.com";
        xml.newChild2("shopperEmail", shopperEmail);

        // optional, An integer value that adds up to the normal fraud score.
        // The value can be either a positive or negative integer.
        xml.newChild2("offset", "0");

        // Apparently this is a required field.
        String shipBeforeDate = "2019-06-04";
        xml.newChild2("shipBeforeDate", shipBeforeDate);

        xml.sortByTag(true);

        // Encode...
        //  "\" (backslash) as "\\"
        //  ":" (colon) as "\:"

        StringBuilder sbTags = new StringBuilder();
        StringBuilder sbValues = new StringBuilder();

        StringBuilder sbContent = new StringBuilder();
        int n = xml.getNumChildren();
        int i = 0;
        while (i < n) {
            if (i > 0) {
                sbTags.append(":");
                sbValues.append(":");
            }

            xml.getChild2(i);
            sbTags.append(xml.getTag());

            sbContent.setString(xml.getContent());
            int numReplaced = sbContent.replace("\\", "\\\\");
            numReplaced = sbContent.replace(":", "\\:");
            sbValues.appendSb(sbContent);
            xml.getParent2();

            i = i + 1;
        }

        StringBuilder sbSigningStr = new StringBuilder();
        sbSigningStr.appendSb(sbTags);
        sbSigningStr.append(":");
        sbSigningStr.appendSb(sbValues);

        Crypt2 crypt = new Crypt2();
        crypt.setHashAlgorithm("sha256");
        crypt.setMacAlgorithm("hmac");

        String hmacKey = "934D1E806DDD99595EB430076FD7F8E4D12D0A3F51243A4C0C3897703118E739";
        crypt.setMacKeyEncoded(hmacKey, "hex");

        crypt.setEncodingMode("base64");
        String merchantSig = crypt.macStringENC(sbSigningStr.getAsString());

        System.out.println(merchantSig);
    }
}