Okla. Stat. tit. 36, § 36-4214: Direct payment of premiums

In the case of weekly premium policies, there may be a provision

that upon proper notice to the insurer, while premiums on the policy

are not in default beyond the grace period, of the intention to pay

future premiums directly to the insurer at its home office or any

office designated by the insurer for the purpose, the insurer will,

at the end of each period of a year from the due date of the first

premium so paid, for which period such premiums are so paid

continuously without default beyond the grace period, refund a

stated percentage of the premiums in an amount which fairly

represents the savings in collection expense.