change oscommerce (php)

I need an experienced PHP-coder who knows the oscommerce shopping cart. Right now I have the problem that a buyer has to register twice, once in my shop, and the second time in the payment-module. Of course this is too much... I want that the payment module gets the data directly from my shop-formulars... Also playing mp3-files should be direct, not with opening a popup-window. Probably there will be 1-2 other small issues, but I can promise you that it will be nothing big. Please bid only if you have experience with the oscommerce shop, thanks. ## 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 php