Paypal Payment Gateway Integration using ASP.NET


First Create Paypal sandbox account
 https://developer.paypal.com/

 For Sandbox :-  "https://www.sandbox.paypal.com/cgi-bin/webscr?";
For Live :-  "https://www.paypal.com/cgi-bin/webscr?";

==================On Pay Button Click
--------------------------------Check whether item in list
if (dt.Rows.Count != 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                if (i == 0)
                {
                    url = "https://www.sandbox.paypal.com/cgi-bin/webscr?";
                    url += "cmd=_cart";
                    url += "&upload=" + i.ToString() + "";
                    url += "&business=sandbox@wantola.com";
                    url += "&item_number_1=" + dt.Rows[i]["Product_Id"].ToString();
                    url += "&item_name_1=" + dt.Rows[i]["Product"].ToString();
                    url += "&amount_1=" + Convert.ToUInt32(dt.Rows[i]["Product_Unit_Cost"]).ToString();
                    url += "&quantity_1=" + dt.Rows[i]["Product_Cnt"].ToString();
                }
                else
                {
                    url += "&item_number_" + (i + 1).ToString() + "=" + dt.Rows[i]["Product_Id"].ToString();
                    url += "&item_name_" + (i + 1).ToString() + "=" + dt.Rows[i]["Product"].ToString();
                    url += "&amount_" + (i + 1).ToString() + "=" + Convert.ToUInt32(dt.Rows[i]["Product_Unit_Cost"]).ToString();
                    url += "&quantity_" + (i + 1).ToString() + "=" + dt.Rows[i]["Product_Cnt"].ToString();
                }
            }

             url += "&return=http://Domainname/return url";
            url += "&notify_url=http:// Domainname/noftifyUrl";
            url += "&cancel_return=CancelURL";
            url += "&currency_code=USD";
            url += "&custom=" + custom;
            url += "&image_url=LOGO path";

====================On Notify Page Load Event
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";
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strSandbox);

         //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);
        strRequest += "&cmd=_notify-validate";
        req.ContentLength = strRequest.Length;
 //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();
        streamIn.Close();

         if (strResponse == "VERIFIED")
        {
  //==== SuccessFull
//============Get All Item Data

 foreach (string key in Request.Form.AllKeys)
                {
                 
                    if (key.StartsWith("item_name") && "item_name".Length < key.Length)
                    {
                        item_names = item_names + "~" + Convert.ToString(Request.Form["" + key + ""]);
                        item_namesKeys = item_namesKeys + "~" + Convert.ToString(key);
                    }
                    else if (key.StartsWith("item_number") && "item_number".Length < key.Length)
                    {
                        item_numbers = item_numbers + "~" + Convert.ToString(Request.Form["" + key + ""]);
                        item_numbersKey = item_numbersKey + "~" + Convert.ToString(key);
                    }
                    else if (key.StartsWith("quantity") && "quantity".Length < key.Length)
                    {
                        quantitys = quantitys + "~" + Convert.ToString(Request.Form["" + key + ""]);
                        quantitysKeys = quantitysKeys + "~" + Convert.ToString(key);
                    }
                    else if (key.StartsWith("mc_gross") && "mc_gross".Length < key.Length)
                    {
                        mc_gross_charges = mc_gross_charges + "~" + Convert.ToString(Request.Form["" + key + ""]);
                        mc_gross_chargesKeys = mc_gross_chargesKeys + "~" + Convert.ToString(key);
                    }
                    else if (key.StartsWith("mc_handling") && "mc_handling".Length < key.Length)
                    {
                        mc_handling_charges = mc_handling_charges + "~" + Convert.ToString(Request.Form["" + key + ""]);
                        mc_handling_chargesKeys = mc_handling_chargesKeys + "~" + Convert.ToString(key);
                    }
                    else if (key.StartsWith("mc_shipping") && "mc_shipping".Length < key.Length)
                    {
                        mc_shipping_charges = mc_shipping_charges + "~" + Convert.ToString(Request.Form["" + key + ""]);
                        mc_shipping_chargesKeys = mc_shipping_chargesKeys + "~" + Convert.ToString(key);
                    }
                }
string test_ipn=Convert.ToString(Request.Form["test_ipn"]);
               string ipn_track_Id= Convert.ToString(Request.Form["ipn_track_Id"]);
              string txn_type= Convert.ToString(Request.Form["txn_type"]);
            string  txn_id=Convert.ToString(Request.Form["txn_id"]);



 }

Comments

  1. Yogesh ChaudhariJune 22, 2012 at 12:01 AM

    Thanks Amol.
    Your imformation is really helpfull for me. i confuse about notify url.
    i got my mistake. actually i use test account but in notify url i use valid paypal account. thanks.

    ReplyDelete
  2. MemtechJune 13, 2013 at 6:04 PM

    This is awesome!! Really helpful for me and developers. Thanks for sharing with us. Following links also helped me to complete my task.

    http://www.mindstick.com/Articles/41de052a-37e1-41db-aa4c-123313be444a/?How%20to%20integrate%20PayPal%20in%20Asp%20Net

    http://www.codeproject.com/Tips/474197/PayPal-Gateway-Integration-in-ASP-NET

    ReplyDelete

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