1.2 incorporates a few little bug fixes as well as the addition of AVS (Address Verification) for transactions to verify billing addresses. This should have gone in a while ago, but well you get what you pay for.
This has been sitting in CVS for some time, The changes were added a while back. Here is the CHANGELOG
23 August 2006 Shaun Murray <shaun [at] aegisdesign dot co dot uk>:
+ Retry connection to server 5 times before quitting
+ Cvv2 in Auth
+ SetOrderID in Auth
+ StartDate and IssueNum vars
+ Added CHANGELOG file
1.0 Initial Revision
The first version of the library has been released today, it contains a simply demo script in there demonstrating a basic use of the library. Hopefully someone will find this useful as I was unable to find anyone who knew anything about the HSBC XML API & PHP. lots of Java support, but this is the first PHP library (I think).