Optimize MP3 Shopping Cart Checkout

The following MP3 shopping cart connects with Paypal for payment. I believe it stores the shopping cart items via cookies, then you're taken to a PHP page with the paypal button form code. Once a user pays, they are taken to a thank you PHP page which sends them links to their downloads. about 30% of all purchases are not receiving the download links email at all, something is going wrong in the checkout process and could be due to the poor cookie bases system. (In the admin section, the server still has them mark, not paid) Cookies was chosen because this player needs to work on [login to view URL] and [login to view URL] which doesn't allow script access and so on. This checkout process may need to be recoded to use IPN or another more reliable method. The back end is all PHP and the cart is AS3 which may or may not need to be modified. (I have all source codes) [login to view URL] I expect coder to code a much more reliable solution with a higher success rate. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows? (depending on the nature? of the deliverables): a)? For web sites or? other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software? installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Linux