Okla. Stat. tit. 36, § 36-3626: Payment discharges insurer

Whenever the proceeds of or payments under a life or accident

and health insurance policy or annuity contract heretofore or

hereafter issued become payable in accordance with the terms of such

policy or contract, or the exercise of any right or privilege

thereunder, and the insurer makes payment thereof in accordance with

the terms of the policy or contract or in accordance with any

written assignment thereof, the person then designated in the policy

or contract or by such assignment as being entitled thereto shall be

entitled to receive such proceeds or payments and to give full

acquittance therefor, and such payments shall fully discharge the

insurer from all claims under the policy or contract unless, before

payment is made, the insurer has received at its home office written

notice by or on behalf of some other person that such other person

claims to be entitled to such payment or some interest in the policy

or contract.