Credit card. I contaced VsTank Inc and they said they talked with Toyeast and Toyeast stated they had sent a reply to me????? I haven't gotten a reply and trust me, I check several times a day. I hope by VsTank talking with them that it will maybe light a fire under them to ship the product. I just don't understand. I mean, if they are out of stock, just let me know, I can be patient when need be, but I have heard nothing except, "Hey we got your money, Thanks!"