asked on

Need Example of PayPal IPN Integration

The user is being returned to my IPN Listener as expected.

However the request object key count is 0.

What am I missing?

Please correct my code. I have already reviewed over 30 pages of IPN documentation.

<form action="https://www.paypal.com/cgi-bin/webscr" method="post"> 

<input type="hidden" name="first_name" value="David"/>
<input type="hidden" name="last_name" value="Martin"/>
<input type="hidden" name="address_street" value="7005 Southwind Drive"/>

<input type="hidden" name="credit_card_number" value="abc"/>
<input type="hidden" name="city" value="Biloxi"/>
<input type="hidden" name="state" value="MS"/>
<input type="hidden" name="zip" value="39532"/>
<input type="hidden" name="telephone" value="228-396-5708"/>
<input type="hidden" name="mm" value="01"/>
<input type="hidden" name="yy" value="13"/>
<input type="hidden" name="email" value="dovberman@cableone.net"/>
<input type="hidden" name="no_email" value="1"/>
   
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<input type="hidden" name="cmd" value="_s-xclick"/>
<input type="hidden" name="hosted_button_id" value="2GEF2YNF55VLJ"/>

<input type="image" src="https://www.paypal.com/en_US/i/btn/btn_buynowCC_LG.gif"  
    name="submit" alt="PayPal - The safer, easier way to pay online!"/>
<img alt="" border="0" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1"/>

</form>

-------

public partial class PaymentReceipt : System.Web.UI.Page
{
    public string strUserName = "";
    public MembershipUser currentUser;
    public System.Configuration.ConnectionStringSettings connString;
    public string strConnection;
    public SqlConnection conStockSelect;

    protected void Page_Load(object sender, EventArgs e)
    {
        //Post back to either sandbox or live	
        string strSandbox = "https://www.sandbox.paypal.com/cgi-bin/webscr";
        string strLive = "https://www.paypal.com/cgi-bin/webscr";

        lblCustomerName.Text = Request.QueryString.Keys.Count.ToString(); // displays 0.

        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strLive);
        //Set values for the request back	
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        
        byte[] param = Request.BinaryRead(HttpContext.Current.Request.ContentLength);
        string strRequest = Encoding.ASCII.GetString(param);
        string strResponse_copy = strRequest;
        //Save a copy of the initial info sent by PayPal

        strRequest += "&cmd=_notify-validate";
        req.ContentLength = strRequest.Length;
        //for proxy	//WebProxy proxy = new WebProxy(new Uri("http://url:port#"));
        //req.Proxy = proxy;	
        
        //Send the request to PayPal and get the response
        StreamWriter streamOut =
            new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
        streamOut.Write(strRequest);
        streamOut.Close();
        StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream());
        string strResponse = streamIn.ReadToEnd();
        lblstrRequest.Text = strResponse; // Returns blank
        streamIn.Close();
    }
     /*   
 	if (strResponse == "VERIFIED")	
    {		//check the payment_status is Completed		
        //check that txn_id has not been previously processed		
        //check that receiver_email is your Primary PayPal email		
        //check that payment_amount/payment_currency are correct

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Dovberman

ASKER

I just finished more debugging.

string strResponse = streamIn.ReadToEnd();
lblstrRequest.Text = strResponse; // Returns INVALID
streamIn.Close();

Why is INVALID returned ?

Thanks,

ASKER CERTIFIED SOLUTION

Manoj Patil

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Dovberman

ASKER

I am using the same page as the page the customer is returned to and the IPN page.

Should they be 2 different pages?

Dovberman

ASKER

Suppose I have the following IPN Page named ProcessPayment.aspx

Then in the Page Load code behind:

else if (strResponse == "INVALID")

How do I keep the IPN Page open until the response = "VERFIED" ?

Thanks,

if (strResponse == "VERIFIED")
            {
                //check the payment_status is Completed
                //check that txn_id has not been previously processed
                //check that receiver_email is your Primary PayPal email
                //check that payment_amount/payment_currency are correct
                //process payment
            }
            else if (strResponse == "INVALID")
            {
                //log for manual investigation
            }
            else
            {
                //log response/ipn data for manual investigation
            }

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Dovberman

ASKER

I created an IPN listener named ProcessPayment.aspx.

The listener is not called.

I executed a Subscription Update in 2 places. Then checked the SQL Server table.
The update was not executed.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ProcessPayment.aspx.cs" 
Inherits="ProcessPayment" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Process Payment</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>

-------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Configuration;
using System.Collections;
using System.Web.Security;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;
using System.Text;
using System.IO;

public partial class ProcessPayment : System.Web.UI.Page
{
    public string strUserName = "";
    public MembershipUser currentUser;
    public System.Configuration.ConnectionStringSettings connString;
    public string strConnection;
    public SqlConnection conStockSelect;

    protected void Page_Load(object sender, EventArgs e)
    {
        //Post back to either sandbox or live	
        //string strSandbox = "https://www.sandbox.paypal.com/cgi-bin/webscr";
        string strLive = "https://www.paypal.com/cgi-bin/webscr";

        //lblCustomerName.Text = Request.QueryString.Keys.Count.ToString(); // displays 0.

        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strLive);
        //Set values for the request back	
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";

        byte[] param = Request.BinaryRead(HttpContext.Current.Request.ContentLength);
        string strRequest = Encoding.ASCII.GetString(param);
        string strResponse_copy = strRequest;
        //Save a copy of the initial info sent by PayPal

        strRequest += "&cmd=_notify-validate";
        req.ContentLength = strRequest.Length;
        //for proxy	//WebProxy proxy = new WebProxy(new Uri("http://url:port#"));
        //req.Proxy = proxy;	

        //Send the request to PayPal and get the response
        StreamWriter streamOut =
        new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
        streamOut.Write(strRequest);
        streamOut.Close();
        StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream());
        string strResponse = streamIn.ReadToEnd();
        //lblstrRequest.Text = strResponse;
        streamIn.Close();

        //Get the connection string

        System.Configuration.Configuration rootWebConfig =
        System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("/StockPro");

        connString =
        rootWebConfig.ConnectionStrings.ConnectionStrings["ConStockSelect"];

        // Define the ADO.NET Connection object.
        string strConnection = connString.ToString();
        conStockSelect = new SqlConnection(strConnection);
                
        // Set profile values
        string strUserName = "dovberman";
        MembershipUser currentUser = Membership.GetUser(strUserName);
        Profile.EMail = currentUser.Email;

        string strUserID = currentUser.ProviderUserKey.ToString();
        DateTime dteToday = DateTime.Today;

        string strSQL = "UPDATE Subscriptions ";
        strSQL += "SET IssuesPaid = IssuesPaid + 5 ";
        strSQL += "WHERE UserID = '" + strUserID + "'";         conStockSelect.Open();
        SqlCommand cmd = new SqlCommand();
        cmd.CommandType = System.Data.CommandType.Text;
        cmd.CommandText = strSQL;
        cmd.Connection = conStockSelect;
        cmd.ExecuteNonQuery();
        conStockSelect.Close();

        if (strResponse == "VERIFIED") // Update Subscription
        {
            string strSQL = "UPDATE Subscriptions ";
            strSQL += "SET IssuesPaid = IssuesPaid + 1 " ;
            strSQL += "WHERE UserID = '" + strUserID + "'";         
            
            conStockSelect.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.CommandType = System.Data.CommandType.Text;
            cmd.CommandText = strSQL;
            cmd.Connection = conStockSelect;
            cmd.ExecuteNonQuery();
            conStockSelect.Close();
        }
    }
}

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Dovberman

ASKER

This was a clue. But it was not very helpful.