Okla. Stat. tit. 68, § 500.53

No person shall engage in any business activity in this state as to which a license is required by this act unless the person shall have first obtained the license. Any person who negligently violates this section is subject to a civil penalty in the amount of One Thousand Dollars ($1,000.00). Any person who knowingly violates or knowingly aids and abets another to violate this section with the intent to evade the tax levied by this act shall be guilty of a misdemeanor and shall, upon conviction, be fined not more than One Thousand Dollars ($1,000.00), or be sentenced to a term of not more than one (1) year in the county jail, or shall be punishable by both such fine and imprisonment.