I have tried with two different Visa cards to sign up for the vip membership on FF and it has declined both cards (different times and days), I know for certain that the cards work and there are no restrictions on the cards (called the bank to check).
The only thing I can think of is where you enter the billing address. It is just one large box for the street address, town and state.
I'm wondering if it's something I'm doing wrong or if it's an issue with FF.
Thanks