How do you allow a PDF to be downloaded after a PayPal purchase has been made?

There are lots of options to achieve this. You can simply password-protect a directory where the .pdf file is (easy if you have a hosting account with a control panel). Then mamnually send the login details to the customer's e-mail as shown in the payment notifications you receive from PayPal.

You could automate the task by using PayPal IPN (Instant Payment Notification), altough this requires notable knowledge about server-side scripting.

Both solutions would be very simple and could allow illegal distribution of the passwords. If you need a more powerful solution, you could implement a database-based system that catches PayPal IPN calls and stores them internally, so you could assign per-user passwords and control how many times the file is downloaded per user, altough this is a much harder task and requires a server-side scripting language (PHP, for instance) a database engine (such as MySQL), and some hours of coding :)

If you need a professional solution, please let me know:

askanexpert [-at-] bsharpinternet [-dot-] com

IronXavi

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