Okla. Stat. tit. 59, § 59-858-311: Action not maintainable without allegation and proof

of license.

No person, partnership, association or corporation acting as a

real estate licensee shall bring or maintain an action in any court

in this state for the recovery of a money judgment as compensation

for services rendered in listing, buying, selling, renting, leasing

or exchanging of any real estate without alleging and proving that

such person, partnership, association or corporation was licensed

when the alleged cause of action arose.