Okla. Stat. tit. 14A, § 3-405
Except for reasonable expenses incurred in realizing on a security interest, the agreement with respect to a consumer loan may not provide for charges as a result of default by the debtor other than those authorized by this act. A provision in violation of this section is unenforceable.
Laws 1969, HB 1001, c. 352, § 3-405, emerg. eff. July 1, 1969.