I have a website where users select a mp3 and pay through paypal and I will send out the mp3 file through email.
I want to email a download link which will expire in 24 hours after the purchase after paypal authorises and also I need the download link to be displayed after paypa; authorization so that user can download the mp3 without logging to the account.
I believe you have to do some encrypting or create virtual link to the mp3 file etc to make it work efficiently.