KevinL:blair003: No - is that a requirement now?
(or was it always a requirement?)
It was always a requirement. Most people are using an Air NZ OneSmart card, for instance.
This isn't 100% true, I did get that error a lot, but after 50+ tries it went through, so I am not sure that it is the credit card which is the problem, it may just be Google's system being mucked up.