Okla. Stat. tit. 6, § 1609

Certification of capital accounts. Before opening an office in this state, and annually thereafter so long as a bank office is maintained in this state, an international banking corporation licensed pursuant to the International Bank Act shall certify to the Board the amount of its capital accounts, expressed in the currency of the country of its incorporation. The dollar equivalent of these amounts, as determined by the Board, shall be deemed to be the amount of its capital accounts.