Glad this got worked out. I can imagine GunPal being an appealing target for a anti-gun hacker... of which, I'm sure there are many.
The security technologies behind legit online credit card handling companies is truly mind-boggling. Just to be in compliance as a vendor (e.g. with Visa/MC) is pretty involved. FAR more secure than most can imagine, and FAR more than almost all utlize on a home computer. Not perfect, but the source on almost all issues is the home computer.