I need a PHP script that will allow me to sell digital goods through my website. It must be secure and integrate with PayPal's IPN service, and provide one-time access to the purchase page, where the user can download the file. So, once they make the payment via PayPal, they will be redirected to a custom page that contains instructions and a download link to the digital item (MP3, PDF, etc). The page and download can only be accessed one time. Please use the below Javascript in conjunction with the "Buy Now" button, so I can assert some purchasing terms. [login to view URL] Requirements: A. Must be able to edit a config file to add/edit products/prices. B. Allow me to set path to file directory. C. Email notification to admin with purchase details, order #, date, IP, and browser client. D. Prevent hacking please.