Asp.net and c#

There has been a lot written about how to handle the IPN return from PayPal so I will not go too deeply into that process, but it seems that there has not been too much written about the initial call to PayPal and that is where I will focus. This article summarizes how to perform a user registration process which requires payment and how to integrate that with PayPal. This sort of process would exist for instance on a web form where you want to charge for registration. The problem I set out to solve was to create a web site where I charged some nominal fee for registration. I chose to use PayPal b/c everything had already been set up for you and I did not want to have to worry about ssl and handling credit card information. I understood how to handle things once the PayPal transaction was completed, but I could not figure out how to have a user register, do some database processing, and then if there were some problems with the registration process prevent the user f...

E-Commerce applications require mechanisms for payment. Although more commonly than not e-Commerce sites will use full credit card processing gateways, giving PayPal as an additional option of payment provides additional payment options for your customers, especially those that don’t want to pay by credit card over the Internet. If you run a Web shop that uses direct credit card processing and want to integrate PayPal seamlessly, you’ll find that using PayPal as a processing service is not as straight forward as using a payment gateway. In this article I describe how you can minimize the external PayPal interaction and work the PayPal payment into the order processing workflow to provide a seamless interface using ASP.NET and C#. However, the principles used here should be applicable to any Web programming environment. Payment processing on the Web is a big market and there a myriad of services and providers that allow you to process credit cards and bank cards over Internet connection...

Introduction A while ago I started working on converting an eCommerce payment gateway's ( DataCash ) COM server to a native .NET assembly using their XML API. Once I had got a basic version working I decided to produce a simple web form to test it out, and so opened it up for all comers (and received some very generous donations from CP members -- thanks guys :). As part of this web form I wanted to include support to check that users had entered a card number, expiration date etc., and then wanted to extend it further to include support for checking that the card number was valid before issuing a request to the payment gateway's server. This is the result, a drop-in replacement for any of the other validation controls. Incidentally, you can see a demo of the validator in use (as well as the card payment gateway assembly) at the following address: https://ssl500.securepod.com/oobaloo/DataCash/ , besides this you may also be interested in the everything you ever wanted to know a...

Electronic Payment processing continues to be a common theme for many Web based applications and while the process is getting easier with the market maturing, there's still a maze of choices and options in setting up your payment solutions and get them integrated into existing applications. In this article, I'll give a high level overview of the electronic payment processing by looking at the various players involved in the payment processing operation and some suggestions and options you have on getting hooked up with the right provider. I'll talk about how the process works, what it takes to get started and what it's going to cost. Finally I'll take you through an application that integrates payment processing and show a class you can use to integrate a few of the common Gateway services into existing applications. The process of taking electronic payments from customers and getting the money deposited into your own accounts is a winding one, with several levels o...