Hey Guys ,
   I am designing a shopping cart application.I like to implement
selling product online.Where Should i start.Like verification of credit card. Let me know whether there is sample app or tutorials.

Thanks In ADvance

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Check It out

PayPal exposes there API to process transactions (all of your users would have to be PayPal users to use this method though)

Outside of that you are going to need to setup some sort of Merchant Account as well as SSL on your server and off the top of my head cant think of any apps or tutorials, though they do exist, google it.

--Stole this from a moderator

I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.

dparsons
Relevent Answers are best suited in p2p.Not a too smart Answers Like Urs.
AnyWay Thanks

Those are quite relevant answers, although, if you mean to say that since I told you to google for tutorials on the matter, I am sorry you took it as such, but it has been a long time since I have dealt with setting up such things so I don't have any links avaiable for you off the top of my head.

--Stole this from a moderator

I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.