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One way is using PayPal IPN. Just go to Paypal to read about this or Google for it.
Another option is what I use.
I purchased a script called DLGuard. It does two things.
It communicates with PayPal and prepares your book for download.
It protects your book from theft. You can place it outside your website and DLGuard will prepare a link for your customer.
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It's Never Too Late To Learn.
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