Debugging and Fixing of HSBC E-Secure Payments with Zencart

Hi, We have a Zencart based E-Commerce site designed and implemented by another GAF member. They are having some issues installing a HSBC E-Secure Payments module in Zencart. This project will be to debug through the code, find out what wrong and fix it so that it works. There have been issues with this integration before which you can see by trawling through the web. But for someone who has installed similar modules before, this should be no problem. I will provide all details like the login, CPI hash key, integration guide etc. You will however be required to show me one of your previous sites you have integrated. Thank you!