Hotel Booking Engine Required (PHP based)

We require a hotel reservation system written in PHP. The code should be fully commented throughout and we require sole global selling rights to the finished source code. All design work and layout will be done in-house by ourselves, it is the booking engine framework that is required. A full specification is available upon request. The key features will be: Client Side - 1. Check availability based on dates 2. Produce results for those dates to include any offers available during that date range and any offers available on dates either side of the specified stay dates 3. The ability to offer additional room extras once the dates have been chosen 3. Create secure online booking & confirmation emails with the ability to link through to multiple payment gateways and return a confirmation 4 Multi Currency for Payment Hotel Side - 1. Allow easy updating of room availability and room quantities 2. Up to 5 master room types (Single/Double/etc..), 10 sub-room types (Sea View/Balcony/etc..) and 5 Meal Plans (Room Only, B&B, Full Board, etc...) [login to view URL] 10 room extras (flowers/late check in, etc...) with up to 10 options for each of these extras, and the ability for the extras to be charged as Free/Fixed Price/%of room) 4. Creation of 5 Special offer packages - Free Nights (Book 3, pay for 2) - % Discount (25% off if booking for 3 or more nights) - Extra Night at % Discount (Book 3, Pay for 2 full price, 3rd at 50%, etc..) - Fixed Discount (Double Room for Single Occupancy) - Voucher Codes (Creation of date restricted/quantity voucher codes for discount) 5. RSS feed of offers and availability Preference for programmers with experience of the hotel market, or having done similar projects.