Hosting Tips: How to Silent Transaction in PayPal with ASP.NET?

In this tutorial, I wil explain you how to Silent Transaction in PayPal with ASP.NET. The following code describes the complete code for silent transaction in PayPal using Merchant account (Pro). Now, it's time to write the code:

using System; 
using System.Net; 
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-CTc0tKI4pa1u.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);  
}  
}

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