I hate to bump an old thread like this, but I have Mastercard
and just assumed it was acceptable. It turns out they don't accept Mastercard, so I sent Carbon support an e-mail about it and they told me an international Visa gift card would work just fine.
I never bought one of these before and was wondering how can you tell if they are internationally accepted.
Secondly, can you purchase them for any amount you want, like say 20 or 30 bucks like any other gift card?
Thank You in advance for any help anyone can offer me, I am so sick of playing step tournaments.