I plan on selling files that a client can download after purchasing and wondering how can I set up a 'temporary' link to the file?

For instance 'Mike' comes along and orders my files - I then send him a link to download the files that are on my server. If I only want the link to work for the first 24 hours after Mike has clicked on it, is there a way to set all this up?

I want to avoid the situration where I have to change the link myself all the time.

Thanks.

well, you could use paypal's shopping cart or buy now buttons...then add a script that checks if they've paid, how much, etc...and then echo out the link...kinda complicated but they have a help forum on this...they may have updated this method to make it simplier for digital purchases