My dad wants to set up a pay-for-download service (for his textbook which I'd guess is in PDF format) on his website, and I know embarrassingly little about such matters.
So far I've found:
http://www.cubecart.com/site/home/
http://www.oscommerce.com/
Any common and easy solutions you might know of?
Well, Google Checkout isn't the sort of thing we need. He'd need an automated system where a person buys rights to download the pdf, and then downloads it.
I may be able to handle it, depending on how user-friendly the cubecart documentation is -- but that's gonna come after finals.
I heard good things about Lulu, but it was in reference to their on-demand book printing. They have ebooks too though: http://www.lulu.com/en/products/ebooks/
Might be worth a look.
That may be a solution, although the creator gets only 80% revenue. My dad's looking for the whole thing, so I'll see what I can do with Cubecart now that I'm on break.
Re: Ye ol' internet commerce
Google Checkout might be a simple and effective way to go. Yahoo also has its own e-commerce suite, if I remember correctly... but it looks like Google's service has some nice perks.
https://checkout.google.com/sell/