Coding Help For Securing Url
I have a website with a store and is to download instrumentals. there is a "buy now" button that sends the customer to paypal and the customer goes through the transaction and once the payment is complete they are sent to a page that has the download link. I don't want the page with the download link accessible for people to just enter the url and have the download link i want it locked someone unless the person goes through the transaction proccess only. If anyone can help please respond.