Hi there. I'm a beginner so hopefully someone can help me.
Say I have a paypal button on my site, that after using it to pay, takes you to a page with a download link on it that allows you to download a file on my sites server. How can I make it so that people can't just bypass the payment process by typing in the url of the download link page?
I've looked into PayPal IPN but I find it hard to understand the underlying code, and wonder if there's another way.
Any actual coding examples would be gratefully appreciated.