Well, the payments seem to fail for every possible reason imaginable (and many of the error messages aren't very descriptive), so it feels like death by a thousand cuts. The problem is that we're new to this game, and reliable information seems surprisingly difficult to find. Maybe it's perfectly normal to see 9 out of 10 people entering bad information or carders trying out numbers, but that seems high to me, and tech support has been useless.

We'll look into what AVS options we have available, and I'm also reading through the Protx link you posted.