PayPal, osCommerce, Idevaffiliate

I have a website that is offered via annual subscription. In place are paypal for payment processing, OsCommerce as the cart and IDevAffiliate as the on-site affiliate tracking tool. My current developers have installed the programs, but don't seem to really know enough about them to make them work bug-free... so I am looking for an eCommerce expert that can help me to establish - proper credit for affiliate partners (it currently processes the commission off the full product amount, not from the actual amount paid - and I use a lot of coupons) - PayPal payment communication with my site (LAMP structure/MySQL) and automatic activation - Cancellation feature where customers can cancel with one click from their confirmation email and both PayPal and the database will register and process it. - Make minor changes to osCommerce to make the sign-up process more smoothly Please note that the bulk of functionalities is established, so I am looking for a bug-hunter and someone that can be a partner for future issues/upgrades in this environment. ## 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 OsCommerce, PayPal, IDevAffiliate Site on Linux server, MySql, using PHP, javascript and Flash.