Okla. Stat. tit. 12A, § 4-214
Oklahoma Code Comment
Under pre-revision sub section 4-212(6) , Oklahoma had changed the uniform Act and provided that a charge-back should be measured by the rate in effect on the day credit was given. This rule had little to recommend it, either to the bank or the customer, and subsection (f) of this Section returns to the uniform rule of using a current date.