Hi i am setting up a mobile ringtone/wallpaper site, and i would like to do the following.

1. I would like it if they could pay via paypal - i know how to do this

2. After Paypal as said paid it gives them a URL (That changes every 30min)

3. I need to find away i can change ether the url link or away so poeple don't give out the URL.

Sorry if that sounds confusing. i was thinking a password that expires after 30min. would that be easyer. and if so how would i do that