Sengkim

Hi all, I'm working on a webshop using oscommerce and I have to use the HSBC CPI. Now, thanks to freerangemum and some others here for the work regarding the PHP part, I did manage to install the needed files and changes. However, I only received a zip file with the CPI stuff in but no manual as for how to install or use it. Can someone give a primer for this? Eternally thankfull! BB Peter