Okla. Admin. Code § 45:20-3-14
All Licensees or employees are prohibited from extending credit. The acceptance by a Licensee or employee of an ordinary bank check or a nationally recognized cash, debit, or similar card will not be considered an extension of credit so long as such check or cash card is accepted in good faith and is not accepted with the intent to defer payment other than for the period of normal processing; PROVIDED, that with regard to acceptance of a nationally recognized cash card, all dollar amounts over Fifty Dollars ($50) be verified prior to acceptance by the licensee. No Retail Licensee or employee shall receive or accept a postdated or undated check in payment for alcoholic beverages. Any arrangements or agreements expressed or implied between a Retail Licensee or employee and customer, whereby the Licensee or employee holds or retains a check received by him from such customer in payment for alcoholic beverages sold, shall be deemed an extension of credit.
Okla. Admin. Code § 45:20-3-14