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Eazypay Payment Gateway Integration in ASP.NET

eazypay is a online payment gateway that lets you pay online by using Cash Deposit, Cheque Deposit, RTGS, NEFT, Net Banking or Cards.
This code is developed to send request to eazypay payment gateway server for making an transaction.

ASEKEY & merchantid will be provided by BANK after submitting return URL to bank

string redirecturl = “”; // this is to check what url is coming before encryption
string encryptredirecturl = “”;

string ASEKEY = “xxxxxxxxxxxxxxxxxxxx”;

string Reference_no, sub_merchant_id, pgamount, Mobile_No, city, name;

Reference_no =”your value”;
sub_merchant_id =”your value”;
pgamount = 000;
Mobile_No = “your value”;;
city =”your value”;
name = “your value”;
redirecturl += “https://eazypay.icicibank.com/EazyPG?”;
redirecturl += “merchantid=xxxxx”;
redirecturl += “&mandatory fields=” + Reference_no + “|” + sub_merchant_id + “|” + pgamount + “|” + Mobile_No + “|456”;
redirecturl += “&optional fields=” + city + “|” + name;
redirecturl += “&returnurl=http://yourwebsite.com/eazypayreturn.aspx”;
redirecturl += “&Reference No=” + Reference_no;
redirecturl += “&submerchantid=” + sub_merchant_id;
redirecturl += “&transaction amount=” + pgamount;
redirecturl += “&paymode=9”;
encryptredirecturl += “https://eazypay.icicibank.com/EazyPG?”;
encryptredirecturl += “merchantid=xxxxx”;
encryptredirecturl += “&mandatory fields=” + encryptFile(Reference_no + “|” + sub_merchant_id + “|” + pgamount + “|” + Mobile_No + “|456”, ASEKEY);
encryptredirecturl += “&optional fields=” + encryptFile(city + “|” + name, ASEKEY);
encryptredirecturl += “&returnurl=” + encryptFile(“http://yourwebsite.com/eazypayreturn.aspx”, ASEKEY);
encryptredirecturl += “&Reference No=” + encryptFile(Reference_no, ASEKEY);
encryptredirecturl += “&submerchantid=” + encryptFile(sub_merchant_id, ASEKEY);
encryptredirecturl += “&transaction amount=” + encryptFile(pgamount, ASEKEY);
encryptredirecturl += “&paymode=” + encryptFile(“9”, ASEKEY);
Response.Redirect(encryptredirecturl);

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public static string encryptFile(string textToEncrypt, string key)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
rijndaelCipher.Mode = CipherMode.ECB;
rijndaelCipher.Padding = PaddingMode.PKCS7;
rijndaelCipher.KeySize = 0x80;
rijndaelCipher.BlockSize = 0x80;
byte[] pwdBytes = Encoding.UTF8.GetBytes(key);
byte[] keyBytes = new byte[0x10];
int len = pwdBytes.Length;
if (len > keyBytes.Length)
{
len = keyBytes.Length;
}
Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = keyBytes;
ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte[] plainText = Encoding.UTF8.GetBytes(textToEncrypt);
return Convert.ToBase64String(transform.TransformFinalBlock(plainText,
0, plainText.Length));
}

************************************************************

After coming back to return url , get response parameters and their vales

foreach (string key in HttpContext.Current.Request.Form.AllKeys)
{
string value = HttpContext.Current.Request.Form[key];

if (value == “E000”)
{
//Success

}
else
{
//Error
}
}

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