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MVC and paypal RSS

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Last post Aug 18, 2012 11:43 PM by mitja.GTI

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ironman99

Member

76 Points

80 Posts

MVC and paypal

Aug 17, 2012 08:58 PM|LINK

Hi, I've been trying to get paypal implemented in my site for about two weeks now. It's been a pain!!! I like this tutorial http://www.asp.net/mvc/videos/mvc-1/aspnet-mvc-storefront/aspnet-mvc-storefront-part-22-restructuring-rerouting-and-paypal , but I'm frustrated because he starts out using IPN and then goes into using PDT but never explains how he implemented it.

I'm able to post values to paypal, but actually recieving anything back from paypal has been my hang up.

here is what I've tried:

public ActionResult IPN()
        {
            var formVals = new Dictionary<string, string>();
            formVals.Add("cmd", "_notify-validate");

            string response = GetPayPalResponse(formVals, true);

            if (response == "VERIFIED")
            {
                string transactionID = Request["txn_id"];
                string sAmountPaid = Request["mc_gross"];
                string orderID = Request["custom"];

                //_logger.Info("IPN Verified for order " + orderID);

                //validate the order
                Decimal amountPaid = 0;
                Decimal.TryParse(sAmountPaid, out amountPaid);

                //Order order = _orderService.GetOrder(new Guid(orderID));
                //Order order = null;
                //check the amount paid

                ProcessedItems order = null;

                if (AmountPaidIsValid(order, amountPaid))
                {
                    int itmNum;
                    order.OrderID = GetPDTValue(response, "custom");
                    order.Name = GetPDTValue(response, "first_name") + GetPDTValue(response, "last_name");
                    bool result = Int32.TryParse(GetPDTValue(response, "item_number"), out itmNum);
                    if (true == result)
                        order.ProductID = itmNum;
                    order.Line1 = GetPDTValue(response, "address_street");
                    order.City = GetPDTValue(response, "address_city");
                    order.State = GetPDTValue(response, "address_state");
                    order.Country = GetPDTValue(response, "address_country");
                    order.Zip = GetPDTValue(response, "address_zip");
                    order.Status = "Paid";


                    //process it
                    try
                    {
                        //_pipeline.AcceptPalPayment(order, transactionID, amountPaid);
                        //_logger.Info("IPN Order successfully transacted: " + orderID);
                        return RedirectToAction("RedirectFromPayPal");
                    }
                    catch
                    {
                        //HandleProcessingError(order, x);
                        return View();
                    }
                }
                else
                {
                    //let fail - this is the IPN so there is no viewer
                }
            }


            return View();
        }

        /// <summary>
        /// Handles the PDT Response from PayPal
        /// </summary>
        /// <returns></returns>
        public ActionResult PDT()
        {
            //_logger.Info("PDT Invoked");
            string transactionID = Request.QueryString["tx"];
            string sAmountPaid = Request.QueryString["amt"];
            string orderID = Request.QueryString["cm"];


            var formVals = new Dictionary<string, string>();
            formVals.Add("cmd", "_notify-synch");
            formVals.Add("at", "id goes here");
            formVals.Add("tx", transactionID);

            string response = GetPayPalResponse(formVals, true);
            //_logger.Info("PDT Response received: " + response);
            if (response.StartsWith("SUCCESS"))
            {
                //_logger.Info("PDT Response received for order " + orderID);

                //validate the order
                Decimal amountPaid = 0;
                Decimal.TryParse(sAmountPaid, out amountPaid);

                ProcessedItems order = null;
                //Order order = null;

                if (AmountPaidIsValid(order, amountPaid))
                {
                    int itmNum;
                    order.OrderID = GetPDTValue(response, "custom");
                    order.Name = GetPDTValue(response, "first_name") + GetPDTValue(response, "last_name");
                    bool result= Int32.TryParse(GetPDTValue(response, "item_number"), out itmNum);
                    if(true == result)
                        order.ProductID = itmNum;
                    
                    order.Line1 = GetPDTValue(response, "address_street");
                    order.City = GetPDTValue(response, "address_city");
                    order.State = GetPDTValue(response, "address_state");
                    order.Country = GetPDTValue(response, "address_country");
                    order.Zip = GetPDTValue(response, "address_zip");
                    order.Status = "Paid";

                    processedItems.SaveItem(order);
                    //var add = new Address();
                    //add.FirstName = GetPDTValue(response, "first_name");
                    //add.LastName = GetPDTValue(response, "last_name");
                    //add.Email = GetPDTValue(response, "payer_email");
                    //add.Street1 = GetPDTValue(response, "address_street");
                    //add.City = GetPDTValue(response, "address_city");
                    //add.StateOrProvince = GetPDTValue(response, "address_state");
                    //add.Country = GetPDTValue(response, "address_country");
                    //add.Zip = GetPDTValue(response, "address_zip");
                    //add.UserName = order.UserName;


                    //process it
                    try
                    {
                        // _pipeline.AcceptPalPayment(order, transactionID, amountPaid);
                        // _logger.Info("PDT Order successfully transacted: " + orderID);
                        return RedirectToAction("RedirectFromPayPal");
                    }
                    catch
                    {
                        //HandleProcessingError(order, x);
                        return View();
                    }
                }
                else
                {
                    //Payment amount is off
                    //this can happen if you have a Gift cert at PayPal
                    //be careful of this!
                    //HandleProcessingError(order, new InvalidOperationException("Amount paid (" + amountPaid.ToString("C") + ") was below the order total"));
                    return View();
                }
            }
            else
            {
                ViewData["message"] = "Your payment was not successful with PayPal";
                return View();
            }
        }

        /// <summary>
        /// Utility method for handling PayPal Responses
        /// </summary>
        private string GetPayPalResponse(Dictionary<string, string> formVals, bool useSandbox)
        {
            string paypalUrl = useSandbox
                                   ? "https://www.sandbox.paypal.com/cgi-bin/webscr"
                                   : "https://www.paypal.com/cgi-bin/webscr";


            var req = (HttpWebRequest) WebRequest.Create(paypalUrl);

            // Set values for the request back
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";

            byte[] param = Request.BinaryRead(Request.ContentLength);
            string strRequest = Encoding.ASCII.GetString(param);

            var sb = new StringBuilder();
            sb.Append(strRequest);

            foreach (string key in formVals.Keys)
            {
                sb.AppendFormat("&{0}={1}", key, formVals[key]);
            }
            strRequest += sb.ToString();
            req.ContentLength = strRequest.Length;

            //for proxy
            //WebProxy proxy = new WebProxy(new Uri("http://urlort#");
            //req.Proxy = proxy;
            //Send the request to PayPal and get the response
            string response = "";
            using (var streamOut = new StreamWriter(req.GetRequestStream(), Encoding.ASCII))
            {
                streamOut.Write(strRequest);
                streamOut.Close();
                using (var streamIn = new StreamReader(req.GetResponse().GetResponseStream()))
                {
                    response = streamIn.ReadToEnd();
                }
            }

            return response;
        }

        private bool AmountPaidIsValid(ProcessedItems order, decimal amountPaid)
        {
            //pull the order
            bool result = true;

            if (order != null)
            {
                if (order.Price > amountPaid)
                {
                    //_logger.Warn("Invalid order amount to PDT/IPN: " + order.ID + "; Actual: " + amountPaid.ToString("C") + "; Should be: " + order.Total.ToString("C") + "user IP is " + Request.UserHostAddress);
                    result = false;
                }
            }
            else
            {
                //_logger.Warn("Invalid order ID passed to PDT/IPN; user IP is " + Request.UserHostAddress);
            }
            return result;
        }

        private string GetPDTValue(string pdt, string key)
        {
            string[] keys = pdt.Split('\n');
            string thisVal = "";
            string thisKey = "";
            foreach (string s in keys)
            {
                string[] bits = s.Split('=');
                if (bits.Length > 1)
                {
                    thisVal = bits[1];
                    thisKey = bits[0];
                    if (thisKey.Equals(key, StringComparison.InvariantCultureIgnoreCase))
                        break;
                }
            }
            return thisVal;
        }

@using System.Configuration
@using SportsStore.Domain.Entities
@model SportsStore.WebUI.Models.CartIndexViewModel

@{
    ViewBag.Title = "PostToPayPal";
    int itemCount = 0;
    //var processedItem = new SportsStore.Domain.Entities.ProcessedItems();
    //var customID = processedItem.GenerateId();

}

<h2>Order Details</h2>

<div style="width: 900px">
    <div style="float: left; width: 500px">
        <h3>Cart</h3>
        <table width="90%" align="center">
    
            <thead>
                <tr>
                    <th align="center">Quantity</th>
                    <th align="left">Item</th>
                    <th align="right">Price</th>
                    <th align="right">Subtotal</th>
                </tr>
            </thead>
    
            <tbody>
                @foreach (CartLine line in Model.Cart.Lines)
                {
                    <tr>
                        <td align="center">@line.Quantity</td>
                        <td align="left">@line.Product.Name</td>
                        <td align="right">@line.Product.Price.ToString("c")</td>
                        <td align="right">@((line.Quantity*line.Product.Price).ToString("c"))</td>
                    </tr>
                }
            </tbody>
    
            <tfoot>
                <tr>
                    <td colspan="3" align="right">Total:</td>
                    <td align="right">
                        @Model.Cart.ComputeTotalValue().ToString("c")
                    </td>
                </tr>
            </tfoot>

        </table>
    </div>

    <div style="float: right; width: 400px">
        <h3>Shipping Information</h3>
        <table width="90%" align="center">
    
            <thead>
                <tr>
                    <th align="center">Name</th>
                    <th align="left">Address</th>
                    <th align="right">City</th>
                    <th align="right">State</th>
                    <th align="right">Zip</th>
                </tr>
            </thead>
    
            <tbody>
                <tr>
                    <td align="center">@Model.ShippingDetails.Name</td>
                    <td align="left">@Model.ShippingDetails.Line1</td>
                    <td align="right">@Model.ShippingDetails.City</td>
                    <td align="right">@Model.ShippingDetails.State</td>
                    <td align="right">@Model.ShippingDetails.Zip</td>
                </tr>
            </tbody>
    
            <tfoot>
                <tr>
                </tr>
            </tfoot>

        </table>
    </div>
</div>
            
<form id="Paypal" name="Paypal" action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="POST">

    @Html.Hidden("cmd", "_cart")
    @Html.Hidden("upload", "1")
    @Html.Hidden("business", ConfigurationManager.AppSettings["BusinessAccountKey"])
    @Html.Hidden("custom", Model.OrderID)
@*    @Html.Hidden("tax_cart",)*@
    @Html.Hidden("currency_code", ConfigurationManager.AppSettings["CurrencyCode"])
    @Html.Hidden("return", ConfigurationManager.AppSettings["ReturnURL"])
    @Html.Hidden("cancel_return", ConfigurationManager.AppSettings["CancelURL"])
    
    @Html.Hidden("first_name", Model.ShippingDetails.Name)
    @Html.Hidden("last_name", Model.ShippingDetails.Name)
    @Html.Hidden("address1", Model.ShippingDetails.Line1)
    @Html.Hidden("address2", Model.ShippingDetails.Line1)
    @Html.Hidden("city", Model.ShippingDetails.City)
    @Html.Hidden("state", Model.ShippingDetails.State)
    @Html.Hidden("country", Model.ShippingDetails.Country)
    @Html.Hidden("zip", Model.ShippingDetails.Zip)
                
                
                
    @foreach (CartLine item in Model.Cart.Lines)
    {
        itemCount++;

        @Html.Hidden("item_name_" + itemCount.ToString(), item.Product.Name)
        @Html.Hidden("item_number_" + itemCount.ToString(), item.Product.ProductID)
        @Html.Hidden("amount_" + itemCount.ToString(), item.Product.Price.ToString())
        @Html.Hidden("quantity_" + itemCount.ToString(), item.Quantity.ToString())
        @Html.Hidden("shipping_" + itemCount.ToString(), item.Product.Price.ToString())
        @Html.Hidden("handling_" + itemCount.ToString(), 0)
    }
    
    <div style="margin-top: 50px; float: right;">
    <input type="image" src="https://www.sandbox.paypal.com/en_US/i/btn/btn_buynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!"/>
    </div>

</form>

Edited by ironman99 on Aug 17, 2012 08:58 PM
Edited by ironman99 on Aug 17, 2012 08:59 PM

- Reply
thinkrajesh

Participant

1356 Points

232 Posts

Re: MVC and paypal

Aug 18, 2012 09:07 AM|LINK

Until anyone response with accurate answer, the following posts may be helpful.

http://www.superstarcoders.com/blogs/posts/paypal-with-asp-net-mvc.aspx

Paypal Express checkout...

http://www.arunrana.net/2012/01/paypal-integration-in-mvc3-and-razor.html

I blog at http://rajeshpillai.net and have a community startup http://ownabook.org/
(Don't forget to click "Mark as Answer" on the post(s) that helped you.)
- Reply
ironman99

Member

76 Points

80 Posts

Re: MVC and paypal

Aug 18, 2012 11:12 PM|LINK
Those are great for posting data to PayPal. My issue is how to handle data from PayPal. Website -> PayPal , PayPal -> website. My issues are in the second part . Thanks

paypal integration mvc
- Reply
mitja.GTI

Star

11157 Points

2094 Posts

Re: MVC and paypal

Aug 18, 2012 11:43 PM|LINK

Please go trough Getting Started with PayPal and ASP.net. Note that he mentions examples. Yep! They are available to download and you can learn from them too.

Happy coding and don't give up!

Please "Mark As Answer" if the post helped you.
mitja.gti | www.mitjagti.com
- Marked as answer by Young Yang - MSFT on Aug 27, 2012 01:58 AM