Java

Payeezy HMAC Computation

See more HTTP Misc Examples

Demonstrates how to calculate the HMAC for a Payeezy REST request. Chilkat2 Java

import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.DateTime;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Prng;
import com.chilkatsoft.chilkat2.StringBuilder;

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.

        Crypt2 crypt = new Crypt2();
        Prng prng = new Prng();

        // An API key such as y6pWAJNyJyjGv66IsVuWnklkKUPFbb0a
        String apiKey = "my_api_key";
        // An API secret such as 86fbae7030253af3cd15faef2a1f4b67353e41fb6799f576b5093ae52901e6f7
        String apiSecret = "my_api_secret";
        // A token such as fdoa-a480ce8951daa73262734cf102641994c1e55e7cdf4c02b6
        String token = "my_merchant_token";

        // The nonce is a random number (bytes), something like "6057786719490086000"
        String nonce = prng.genRandom(8, "decimal");
        System.out.println("nonce = " + nonce);

        DateTime dtNow = new DateTime();
        dtNow.setFromCurrentSystemTime();
        StringBuilder sbTimestamp = new StringBuilder();
        // Get the epoch timestamp in seconds
        sbTimestamp.append(dtNow.getAsUnixTimeStr(false));
        // Change it to milliseconds
        sbTimestamp.append("000");
        // The timestamp is a number similar to this: 1546011905000 (which is a timestamp taken on 28-Dec-2018).
        String timestamp = sbTimestamp.getAsString();
        System.out.println("timestamp = " + timestamp);

        // Generate the following JSON request body:
        //     {
        //       "merchant_ref": "Astonishing-Sale",
        //       "transaction_type": "authorize",
        //       "method": "token",
        //       "amount": "200",
        //       "currency_code": "USD",
        //       "token": {
        //         "token_type": "FDToken",
        //         "token_data": {
        //           "type": "visa",
        //           "value": "2537446225198291",
        //           "cardholder_name": "JohnSmith",
        //           "exp_date": "1030",
        //           "special_payment": "B"
        //         }
        //       }
        //     }

        JsonObject json = new JsonObject();
        json.updateString("merchant_ref", "Astonishing-Sale");
        json.updateString("transaction_type", "authorize");
        json.updateString("method", "token");
        json.updateString("amount", "200");
        json.updateString("currency_code", "USD");
        json.updateString("token.token_type", "FDToken");
        json.updateString("token.token_data.type", "visa");
        json.updateString("token.token_data.value", "2537446225198291");
        json.updateString("token.token_data.cardholder_name", "JohnSmith");
        json.updateString("token.token_data.exp_date", "1030");
        json.updateString("token.token_data.special_payment", "B");

        // string hashData = apiKey + nonce + timestamp + token + jsonString;
        StringBuilder sbHmacData = new StringBuilder();
        sbHmacData.append(apiKey);
        sbHmacData.append(nonce);
        sbHmacData.append(timestamp);
        sbHmacData.append(token);
        sbHmacData.append(json.emit());

        // HMAC the data to produce a hex string.
        crypt.setEncodingMode("hexlower");
        crypt.setMacAlgorithm("hmac");
        crypt.setMacKeyString(apiSecret);
        crypt.setHashAlgorithm("sha256");
        crypt.setCharset("utf-8");
        String hexHash = crypt.macStringENC(sbHmacData.getAsString());

        // Now base64 encode the hex string:
        StringBuilder sbBase64Hash = new StringBuilder();
        sbBase64Hash.append(hexHash);
        sbBase64Hash.encode("base64", "utf-8");

        System.out.println("This is the Authorization header to be sent with the payeezy request:");
        System.out.println("Authorization: " + sbBase64Hash.getAsString());
    }
}