Well. I am going to start to sell a script on my site and I need it so that they click a button and it proceeds them to paypal and once paid it gives them a one time download link to the script. Once its been downloaded the link is no longer valid. It generates a different link for every buyer. Anything similar around?
i have the script exactly wat you need.. each download link mailed to user expires in a predefined time frame fixed by you.. great script fully compatible with paypal.. pm me if you need.
I use a addon in my drupal which does that. Its very good, but as far as for a website without drupal goes, I have no idea