Okla. Stat. tit. 41, § 41-131: Delinquent rent

A. If rent is unpaid when due, the landlord may bring an action

for recovery of the rent at any time thereafter or the landlord may

wait until the expiration of the period allowed for curing a default

by the tenant, as prescribed in subsection B of this section, before

bringing such action.

B. A landlord may terminate a rental agreement for failure to

pay rent when due, if the tenant fails to pay the rent within five

(5) days after written notice of landlord's demand for payment. The

notice may be given before or after the landlord files any action

authorized by subsection A of this section. Demand for past due

rent is deemed a demand for possession of the premises and no

further notice to quit possession need be given by the landlord to

the tenant for any purpose.