Okla. Stat. tit. 14A, §2-211 (1982)
A. With respect to all sales transactions, a discount which a seller offers, allows or otherwise makes available for the purpose of inducing payment by cash, check or similar means rather than by use of an open-end credit card account shall not constitute a credit service charge as determined under §2-109 of this title if the discount is offered to all prospective buyers clearly and conspicuously in accordance with regulations of the administrator of Consumer Affairs.