Richard,
I've finished the changes for verisign-module that I found necessary for our use with the latest PayFlowPro v.3.05 payment processing interface.
I submitted diffs for both 4.7 (https://openacs.org/bugtracker/openacs/bug?bug%5fnumber=257) and 4.6 (https://openacs.org/bugtracker/openacs/bug?bug%5fnumber=258) as well as made this module available through our website at:
http://www.ncacasi.org/contrib/