The Beer Shop

ashwinirajp · October 1st, 2009, 05:24 AM

from where the value is being passed in querystring id in ordercomleted.aspx.cs

Code:

Order order = Order.GetOrderByID(Convert.ToInt32(this.Request.QueryString["ID"]));
         if (order.StatusID == (int)StatusCode.WaitingForPayment)
         {
            order.StatusID = (int)StatusCode.Confirmed;
            order.Update();

Lee Dumond · October 1st, 2009, 08:15 PM

This comes from the GetPayPalPaymentUrl() method of Order.cs

This is a LONG Url that has a number of other URLs embedded in its quesrystring, one of which is as follows:

string returnUrl = HttpUtility.UrlEncode(baseUrl + "PayPal/OrderCompleted.aspx?ID=" + this.ID.ToString());

When an order is successfully completed, it uses this URL to redirect the user to OrderCompleted.aspx, with the order number appended to the querystring of that request.

ashwinirajp · October 2nd, 2009, 02:41 AM

thanx for your reply,
now i want to know when notify.aspx will run to get verification.

Lee Dumond · October 2nd, 2009, 02:55 PM

Whenever a customer pays for something, they have to click on a link, the URL of which is generated by the GetPayPalPaymentUrl().

You already learned how this long URL's querystring contains other URLs, one of which is returnUrl (see previous post). Another URL it contains is notifyUrl, which the PayPal service hits whenever a link containing the PaymentUrl is clicked.

The purpose of hitting this URL is to allow the programmer to run code that can check if an order is Verified. The Notify.aspx page does that. (Notice that the UI of this page doesn't show anything. It is only there to run code only.)

The code in Notify.aspx first determines if the order is Verified by the PayPal service by sending a POST request with a cmd=_notify_validate parameter. This causes PayPal to emit a response of 'VERIFIED" if the order is verified. Then the code has to check the response to see if it contains "VERIFIED". (I am assuming this was before the days of JSON, which would make this much easier ;)

Then, the Notify.aspx code changes the order's StatusID to StatusCode.Verified in the database.

ashwinirajp · October 5th, 2009, 05:56 AM

Thanx lee but my qus. is
Is it necessary to be on server for an application to get notification messages(notify.aspx) from paypal, or it can get it without ..?
i am not getting paypal notifications on localhost.

Lee Dumond · October 5th, 2009, 12:30 PM

Yes, in order for PayPal to be able to reach the URL that is specified by the notify_url parameter in the PaymentUrl querystring, that URL must be public-facing.

Localhost won't work here, because PayPal cannot send a request to localhost.