I would assume: cash payment available only at register. That's the only way that makes sense to me, you can pay with a server using a card but they would have to go to the till to get cash for change.
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Hard to say. Could be either as I wouldn't expect grammar to be fully correct in a fast food establishment, especially if it's temporary.
If cards are not accepted at the register, cash only is appropriate. However, of the.kiosks don't allow cash, then cash can only be used there.
If it's the former, it would be easier to say no card payment at register, or change the word order to 'Only cash taken at register' If it's the latter a comma would help: 'Cash, only at register'.
Cash,
It means they only accept cash.
No idea why they have to specify at the register. Where else could you pay?
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