Okla. Stat. tit. 18, § 18-487: Estopped to deny liability

Any company which shall execute or guarantee any recognizance,

stipulation, bond, or undertaking under the provisions of this

article, shall be estopped in any such proceeding to deny the

liability which it shall have assumed to incur, or to deny its

corporate power to execute or guarantee any such instrument, or

assume such liability.