Cash only! But a $20 or 2 should be plenty if you hit an atm nearby or possibly inside as I believe they had one or there is one in neighboring business.
I believe the "card" mentioned below was a coffee card, for which you prepay. No debit or credit cards accepted.
Cash only, no cards. They do have an atm inside though.
They have an ATM
I have used a card several times. I have an account and regularly pay ahead of use. I believe that I asked about it before and they said it was ok to use a card. Just ask, very nice and friendly staff.
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