Hi, I am wanting to sell a video game I wrote on http://lexiclix.com

What I want to do is only allow someone to download the full version after they have made  a payment. Probably via paypal or google-checkout.

Now, (I have not look into it but) I presume that paypal etc will enable me to call thier API from PHP code. I can then know whether the users payment has been made.

How do I then provide the download? (bearing in mind I dont just want to have a link to the file appear as this could be passed on to people who haven't paid).

Thanks for any ideas.

Cleerline.