paytm .please help..i got below page while intigrate paytm

protected void Page_Load(object sender, EventArgs e)
{
String merchantKey = "o@w1qIz8qqUh0Bdg";
Dictionary<string, string> parameters = new Dictionary<string, string>();
parameters.Add("MID", "SsCkKW41335934713275");
parameters.Add("CHANNEL_ID", "WEB");
parameters.Add("INDUSTRY_TYPE_ID", "Retail");
parameters.Add("WEBSITE", "WEB_STAGING");
parameters.Add("EMAIL", "[email protected]");
parameters.Add("MOBILE_NO", "8500414141");
parameters.Add("CUST_ID", "2");
parameters.Add("ORDER_ID", "1");
parameters.Add("TXN_AMOUNT", "20");
// parameters.Add("CALLBACK_URL", "url"); //This parameter is not mandatory. Use this to pass the callback url dynamically.
string checksum = CheckSum.generateCheckSum(merchantKey, parameters);
string paytmURL = "https://securegw-stage.paytm.in/theia/processTransaction?orderid=" + "6";
string outputHTML = "";
outputHTML += "";
outputHTML += "Merchant Check Out Page";
outputHTML += "";
outputHTML += "";
outputHTML += "
Please do not refresh this page...
";
outputHTML += " + paytmURL + "' name='f1'>";
outputHTML += "";
outputHTML += "";
foreach (string key in parameters.Keys)
{
outputHTML += " + key + "' value='" + parameters[key] + "'>";
}
outputHTML += " + checksum + "'>";
outputHTML += "";
outputHTML += "";
outputHTML += "";
outputHTML += "document.f1.submit();";
outputHTML += "";
outputHTML += "";
outputHTML += "";
outputHTML += "";
Response.Write(outputHTML);
}

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