Paypal shopping cart + Product download pages?

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Hello all, I think I can grok how to implement Paypal's shopping cart
into my site, but can anyone tell me how to configure it to sell
downloadable files (such that the customer ends up at a page where they
can download the files they purchased), without getting a commercial
service to provide that functionality?  If not, can someone point me to
a service that's more affordable than most?  


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