import hashlib
import hmac
import base64
​
postData = {
  "appId" : appId,
  "orderId" : orderId,
  "orderAmount" : orderAmount,
  "orderCurrency" : orderCurrency,
  "orderNote" : orderNote,
  "customerName" : customerName,
  "customerPhone" : customerPhone,
  "customerEmail" : customerEmail,
  "returnUrl" : returnUrl,
  "notifyUrl" : notifyUrl
}
​
sortedKeys = sorted(postData)
signatureData = ""
for key in sortedKeys:
  signatureData += key+postData[key];
​
message = bytes(signatureData).encode('utf-8')
#get secret key from your config
secret = bytes(secretKey).encode('utf-8')
signature = base64.b64encode(hmac.new(secret, message,digestmod=hashlib.sha256).digest())

Map<String, String> postData = new HashMap<String, String>();
  postData.put("appId", appId);
  postData.put("orderId", ORDERID);
  postData.put("orderAmount", ORDERAMOUNT);
  postData.put("orderCurrency", ORDER_CURRENCY);
  postData.put("orderNote", ORDERNOTE);
  postData.put("customerName", CUSTOMER_NAME);
  postData.put("customerEmail", CUSTOMER_EMAIL);
  postData.put("customerPhone", CUSTOMER_PHONE);
  postData.put("returnUrl",RETURN_URL);
  postData.put("notifyUrl", NOTIFY_URL);
  String data = "";
  SortedSet<String> keys = new TreeSet<String>(postData.keySet());
  for (String key : keys) {
      data = data + key + postData.get(key);
  }
  Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
  SecretKeySpec secret_key_spec = new
  SecretKeySpec(secretKey.getBytes(),"HmacSHA256");
  sha256_HMAC.init(secret_key_spec);
  String signature = Base64.getEncoder().encodeToString(sha256_HMAC.doFinal(data.getBytes()));

using System;
using System.Security.Cryptography;
using System.Collections.Generic;
namespace Rextester {
public class Program {
  private string CreateToken(string message, string secret){
    secret = secret ?? "";
    var encoding = new System.Text.ASCIIEncoding();
    byte[] keyByte = encoding.GetBytes(secret);
    byte[] messageBytes = encoding.GetBytes(message);
​
    using (var hmacsha256 = new HMACSHA256(keyByte))
    {
      byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
      return Convert.ToBase64String(hashmessage);
    }
  }
  public static void Main(string[] args) {
​
    string secret = "<your_secret_key>";
    string data = "";  
​
    SortedDictionary<string, string> formParams = new SortedDictionary<string, string>();
    formParams.Add("appId", "<your_app_id>");
    formParams.Add("orderId", "FEX101");
    formParams.Add("orderAmount", "10.00");
    formParams.Add("orderCurrency", "INR");
    formParams.Add("orderNote", "Test payment");
    formParams.Add("customerName", "Customer Name");
    formParams.Add("customerPhone", "9900000085");
    formParams.Add("customerEmail", "[email protected]");
    formParams.Add("returnUrl", "http://example.com");
    formParams.Add("notifyUrl", "http://example.com");
    foreach (var kvp in formParams) {
      data = data + kvp.Key + kvp.Value;
    }
    Program n = new Program();
    string signature = n.CreateToken(data, secret);
    Console.WriteLine(signature);
    }
  }
}

import hashlib
import hmac
import base64
​
@app.route('/notify_url/', methods=["POST"])
def notify_url_process():
​
 postData = {
  "orderId" : request.form['orderId'], 
  "orderAmount" : request.form['orderAmount'], 
  "referenceId" : request.form['referenceId'], 
  "txStatus" : request.form['txStatus'], 
  "paymentMode" : request.form['paymentMode'], 
  "txMsg" : request.form['txMsg'], 
  "txTime" : request.form['txTime'], 
 }
​
 signatureData = postData["orderId"] + postData["orderAmount"] + postData["referenceId"] + postData["txStatus"] + postData["paymentMode"] + postData["txMsg"] + postData["txTime"]
​
 message = bytes(signatureData).encode('utf-8')
 #get secret key from your config
 secret = bytes(secretKey).encode('utf-8')
 signature = base64.b64encode(hmac.new(secret, 
   message,digestmod=hashlib.sha256).digest())

LinkedHashMap<String, String> postData = new LinkedHashMap<String, String>();
​
postData.put("orderId", ORDERID);
postData.put("orderAmount", ORDERAMOUNT);
postData.put("referenceId", REFERENCE_ID);
postData.put("txStatus", TXN_STATUS);
postData.put("paymentMode", PAYMENT_MODE);
postData.put("txMsg", TX_MSG);
postData.put("txTime", TX_TIME);
​
String data = "";
Set<String> keys = postData.keySet();
​
for (String key : keys) {
    data = data + postData.get(key);
}
String secretKey = "" // Get secret key from config;
Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key_spec = new
SecretKeySpec(secretKey.getBytes(),"HmacSHA256");
sha256_HMAC.init(secret_key_spec);
​
String signature = Base64.getEncoder().encodeToString(sha256_HMAC.doFinal(data.getBytes()));
Getting Started
Checkout Form
Step 1: Creating checkout form
Step 2: Checksum Generation
Step 3: Submitting form
Test Card
Webhook Notification
Request Parameters
Response parameters
Response Verification
© 2019 Cashfree Payments India Pvt Ltd

using System;
using System.Security.Cryptography;
using System.Collections.Generic;
namespace Rextester {
  public class Program {
    private string CreateToken(string message, string secret){
      secret = secret ?? "";
      var encoding = new System.Text.ASCIIEncoding();
      byte[] keyByte = encoding.GetBytes(secret);
      byte[] messageBytes = encoding.GetBytes(message);
      
      using (var hmacsha256 = new HMACSHA256(keyByte))
      {
        byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
        return Convert.ToBase64String(hashmessage);
      }
    }
​
    public static void Main(string[] args) {
        
      string secret = "<your_secret_key>";
      string data = "";  
        
      data = data + "FEX101";
      data = data + "10.00";
      data = data + "19992";
      data = data + "SUCCESS";
      data = data + "pg";
      data = data + "payment done";
      data = data + "2018-02-02 17:29:12";
​
      Program n = new Program();
      string signature = n.CreateToken(data, secret);
      Console.WriteLine(signature);
    }
  }
}