What are the rules regarding refunding debit cards in the state of California if a customers returns an item?

Do I have the right as a merchant not to give cash back or refund a debit/check card purchase?|||No, you should never refund in cash when a debit/credit card was used to make the purchase. They will either have to have the card on them or provide you with the sales receipt, which will have the transaction number on it and you can use your terminal to make the refund.