Paypal direct payment ( Silent Transaction ) in ASP.NET

This code describes the complete code for silent transaction in PayPal using Merchant account (Pro).

  

using System.Text;  

using System.IO;  

public partial class PayPal  

{  

    public void DoDirect()  

    {  

        //API Credentials (3-token)  

        string strUsername = "Your userName";  

        string strPassword = "QFZCWN5HZM8VBG7Q";  

        string strSignature = "A21eW1ch..NEqJJ-glaLhqkBMlzeAsWqX0ycck-Tc0tKI4pa1u.rgNF";  

        string strCredentials="USER="+strUsername+"&PWD="+strPassword+"&SIGNATURE="+strSignature;  

        string strNVPSandboxServer = "https://api-3t.sandbox.paypal.com/nvp";  

        string strNVPLiveServer = "https://api-3t.paypal.com/nvp";  

        string strAPIVersion = "2.3"  

        string strNVP = strCredentials + "&METHOD=DoDirectPayment&CREDITCARDTYPE=VISA&ACCT=XXXXXXXXXXXXXXXXX&EXPDATE=092007&CVV2=808&AMT=212.95&FIRSTNAME=Designer&LASTNAME=Fotos&IPADDRESS=255.55.167.002&STREET=1234+Easy+Street&CITY=San+Jose&STATE=CA&COUNTRY=United+States&ZIP=95110&COUNTRYCODE=US&PAYMENTACTION=Sale&VERSION=" + strAPIVersion;  

        //Create web request and web response objects, make sure you using the correct server (sandbox/live)  

        HttpWebRequest wrWebRequest = (HttpWebRequest) WebRequest.Create(strNVPSandboxServer);  

        //Set WebRequest Properties  

        wrWebRequest.Method = "POST";  

        // write the form values into the request message  

        StreamWriter requestWriter = new StreamWriter(wrWebRequest.GetRequestStream());  

        requestWriter.Write(strNVP);  

        requestWriter.Close();  

        // Get the response.  

        HttpWebResponse hwrWebResponse = (HttpWebResponse) wrWebRequest.GetResponse();  

        StreamReader responseReader = new StreamReader(wrWebRequest.GetResponse().GetResponseStream());  

        // and read the response  

        string responseData = responseReader.ReadToEnd();  

        responseReader.Close();  

        string result = Server.UrlDecode(responseData);  

    }  

}