Okla. Stat. tit. 14A, § 14A-1-110: Use of cash discounts

With respect to a credit card which may be used for extensions

of credit in sales transactions in which the seller is a person

other than the card issuer, the card issuer may not, by contract or

otherwise, prohibit any such seller from offering a discount to a

cardholder to induce the cardholder to pay by cash, check or similar

means rather than use a credit card.