Installation and Configuration Steps for .net
These installation steps are for all versions of .net
- Add provided “paytm.dll” as a “Reference” in your project.
- Import namespace “paytm” in your project/solution with statement “using paytm”.
- The Generate CheckSum and Verify CheckSum methods are given below. Their respective usage is given in the next few points.
string return method CheckSum.generateCheckSum(String merchantKey, Dictionary<String, String> parameters) Boolean return method CheckSum.verifyCheckSum(String merchantKey, Dictionary<String, String> parameters, String checkSum) - For Generating CheckSum, use the following code snippet. Note: Replace all the values with the respective values provided by Paytm at the time of registration.
String merchantKey = “merchantKey value” ; Dictionary<string, string> parameters = new Dictionary<string, string>(); parameters.Add("MID", "mid value"); parameters.Add("CHANNEL_ID", "channel id value"); parameters.Add("INDUSTRY_TYPE_ID","industry value"); parameters.Add("WEBSITE", "website value"); parameters.Add("EMAIL", "email value"); parameters.Add("MOBILE_NO", "mobile value"); parameters.Add("CUST_ID", "cust id"); parameters.Add("ORDER_ID", "order id"); parameters.Add("TXN_AMOUNT","amount"); parameters.Add("CALLBACK_URL","url"); //This parameter is not mandatory. Use this to pass the callback url dynamically. string checksum = CheckSum.generateCheckSum(merchantKey, parameters); - Define the Staging server Url here. Replace this with the Production server Url once you move to the production setup.
string paytmURL = "https://pguat.paytm.com/oltp-web/processTransaction?orderid=" + orderid; - Use the following code snippet to make a form post. This will redirect the request to Paytm Payment Gateway.
string outputHTML = "<html>"; outputHTML += "<head>"; outputHTML += "<title>Merchant Check Out Page</title>"; outputHTML += "</head>"; outputHTML += "<body>"; outputHTML += "<center><h1>Please do not refresh this page...</h1></center>"; outputHTML += "<form method='post' action='" + paytmURL + "' name='f1'>"; outputHTML += "<table border='1'>"; outputHTML += "<tbody>"; foreach (string key in parameters.Keys) { outputHTML += "<input type='hidden' name='" + key + "' value='" + parameters[key] + "'>"; } outputHTML += "<input type='hidden' name='CHECKSUMHASH' value='" + checksum + "'>"; outputHTML += "</tbody>"; outputHTML += "</table>"; outputHTML += "<script type='text/javascript'>"; outputHTML += "document.f1.submit();"; outputHTML += "</script>"; outputHTML += "</form>"; outputHTML += "</body>"; outputHTML += "</html>"; Response.Write(outputHTML); - Use the following code snippet to Get the response and verify the checksumhash.
String merchantKey = “merchantKey value” ; // Replace the with the Merchant Key provided by Paytm at the time of registration. Dictionary<string, string> parameters = new Dictionary<string, string>(); string paytmChecksum = ""; foreach (string key in Request.Form.Keys) { parameters.Add(key.Trim(), Request.Form[key].Trim()); } if (parameters.ContainsKey("CHECKSUMHASH")) { paytmChecksum = parameters["CHECKSUMHASH"]; parameters.Remove("CHECKSUMHASH"); } if (CheckSum.verifyCheckSum(merchantKey, parameters, paytmChecksum)) { Response.Write("Checksum Matched"); } else { Response.Write("Checksum MisMatch"); }
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