Suggestions for a "shopping cart" application with a twist? [closed]

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My company wants users to be able to gather different documents from our website (for instance, manuals, installation instructions, etc) and put them all in one place (kind of like a shopping cart) to then print out all at once when their visit is over. Are there any applications that I can leverage to do this? We want something that's fairly plug-and-play because this is a late-stage requirement. I feel like I've come across something like this before but can't remember where.

Any suggestions would be greatly appreciated! Thanks!

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There should be scripts where it bunches all of the selected documents into a zipfile for you. I've seen it on Joomla sites where you select different modules you want to download and it puts it into one package. Sorry I can't help with actual code.

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You say "shopping cart" but are users paying for these documents?

If so, you can outsource the downloads to a third party like PayPal to handle the digital downloads. PayPal API will let you handle a shopping cart.

If not, why not just have a link to a PDF on the document's description page? Then they can save, print, whatever. (My two cents, of course, but I don't see the big advantage to bundling a bunch of documents just to unbundle them on the other end.)