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I hope this answers what you were asking?
Do you mean on a site you are developing? If so, there are a couple of options. The simplest is to use the tool provided at Paypal to create shopping cart buttons and then paste the created code into your pages. They also have a developers toolkit though if you want to get more advanced.
I'm not sure if it does or not. I know about the generated code already and how to paste that on a site. But lets say a client does this and only has one product. Later on he wants to add another product. What does he need to do to do this? I can't help much here since I've never had my own paypal shopping cart, and I'm having trouble finding documentation on this.
I'm guessing paypal has some kind of tool where they enter the new product, then it generates the new code everytime they have a differen't product to add?
Another solution is to use a third party solution such as Oscommerce. It's free and very easy to integrate with a paypal accout. It acts like a shopping cart then when the user wants to checkout it stores the order details and passes the user to paypal to finish the transaction. The order will not be finalized until the payment it finished. It uses a system called Paypal IPN (instant payment notification) it's quite a clever idea and an easy way to have a profesional free shopping cart system.
There are a lot of systems very similar to Oscommerce but I used that as an example because it is open source.