How do use vb.net to build an application that processes credit cards?

Question

How do websites make applications like this using asp.net to charge credit cards?

Answer 1

In order to process credit cards online your software has to interface with a credit-card processing gateway. Roughly, what happens is:
Process a customer order and calculate the amount due
Customer fills in his payment and shipping information
Send the appropriate information to the processing gateway
Process the returned information (card accepted or declined) and complete processing of the order.

You will need a merchant account to let you accept credit cards, a gateway account, and a site security certificate. Shopping cart services can bundle all this together for you, along with the software to make it all run.

If you do want to roll your own, here's a user's manual for one gateway:
http://onlinemerchantcenter.com/docs/downloads/I_getting_started_guide.pdf

Answer 2

depends on your application...is it winforms or webforms?

also, a credit card processing is done by a 3rd party(another company)

for webforms, there are 3rd party components avaiable, like a shopping carts, or you can also setup an account with paypal. I think paypal provide tools for what you want.

http://www.paypal.com/cgi-bin/webscr?cmd=p/pdn/3p-solutions-ipntools-outside
check their website...