I sent an email through the support system, but I wasn't sure if it was a ticketing system and whether or not you could reply directly, so I'm also posting it here in case someone else has an answer.
I am trying to pay by Karma Koin for G1Credits for Fallen Earth. I am in New Zealand, so my $10NZ Karma Koin card is worth just over $7US. I try to redeem the card and get a "Your payment was unsuccessful" message. I've tried over a few days, but it remains the same and my card balance is untouched. It tells me what my full card amount is worth in credits and says I can also pay in smaller increments of $5, but I would like to redeem the full card. Is this an error or can you only pay in quantities of $5US at a time? (Which would make a quarter of my card redundant)