How online transaction works?

Hi all,
Now i had to implement online transaction to a shopping cart site.
It's based on LAMP. (P for php)
I'm 100% sure i got no idea :cry:
I gladly welcome any hints or docs or links or just anything
to kick start my research.

Can you provide some more details to the problem you are trying to solve? What error messages do you get, what program are you trying out or trying to install etc etc.

Do you mean implementing the "talk to the credit card people" part, or implementing the "select an item and add it to your cart" part? The latter should be fundamentally simple and should involve only database transactions. I will assume you are talking about the former part, but I know nothing about either of these.

I found a Wikipedia article, which might be a place to start:
Online transaction processing - Wikipedia, the free encyclopedia

Also, you might try to find some predeveloped solution: I imagine implementing all of this on your own would be very difficult.

However, I know nothing about this subject. If you find any interesting documents, post them here: it would be interesting to learn something about this.

Thanks ...:p
and more informations about the problem-
Example I'm owner of a shoppingcart website called XYZ.com
So far user can see what are all the products available on my site.
Now,I want to allow user to purchase online using credit cards.(similar to ebay,any other e-com site)

i found these two links :
Processing payment in an online store. Part I | Shop-Script Ecommerce Blog
How does online credit card processing work | Shop-Script Ecommerce Blog

Hope to get more info. out of google search and let you know. :)

This is best doc i got :)
Informed-Merchant - Introduction

Hope that helps somebody :)
Cheers