Credit Card processing: Chase PaymenTech

Hello - - --- -- - -- I need to develop Credit Card processing for my current application. We have our own shopping cart. We have been trying in vain to get technical information from PaymenTech for *months* -- but it seems that Chase sold part of it, or split it off into a separate company -- or something. in any case, they seem extremely distracted and unresponsive. By doing some heavy googling, I was able to find some code from a PHP developer's web site, mostly for the format of the xml strings to pass to them. I can't believe that they don't have a processing object for PHP already available, but it seems not. I see in the archives a couple of requests to the group for code, but the most recent was a couple of years old. So, I'll ask again: Anybody have modules, code, tips, land mines, or any other information for doing credit card processing with PaymenTech that you would be willing to share? Many thanks - - - Ken