Betting site

Note: Bidders must have perfect knowledge of online betting exchanges and be php and mysql experts I need betting exchange code platform and database design for my betting site, using php and mysql innodb transactions as reference use [login to view URL] , where punters place bets expecting to be matched by other side, bet orders are server on first come first serve basis input and output is in form of xml data bet orders must contain gameid, userid, timestamp, odds and amount and also generate orderid if full amount of bet can not be matched, than the bet is split to matched bet and the unmatched bet, which is kept still open, waiting for additional matching code must be first of all secure than efficient and optimized for high loads