Modify PHP Paypal automated processing script

We have a script that needs to be customized to work with our custom flash paypal shopping cart. Basically our flash cart sends all of the purchased items from our site at one time using paypals item grouping method. This methos creates a number for each product, adds an underline to the variable hat's being send, followed by the description. So a typical item would look something like this: 1_cost=4.99&1_desc=my description next item 2_cost=3.99&2_desc=my description Currently the php script we need modified only supports non-grouping commands, that look like this: cost=4.99&desc=my description So we need the script to recognize these groupings, locate, and pull the right file from the mysql database. The code that needs to be modified is within an estimated 30 lines of code. Please let me know if you have any other questions. ## 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 All internet browsers.