Integrate new php/mysql web site with HSBC (CPI integration)

I have a jewlerry site which has recently been built in php/mysql. The site needs to be connceted to HSBC payment gateway (CPI integration). Also small bugs in the shopping cart and email list function need to be fixed. This is an emergency project that needs to be completed within 2 days -- so please only reply if you have previous experience in linking an e-commerse site to HSBC. This is not a very large projct as the site is more or less complete- however the ideal candidate will be strongly considered for future work. The url and server details will be released once ideal freelancer on basis of price and time limit is found. London based freelancers are preferred -- however if you have previous experience in HSBC-- location will not be an issue.