Okla. Stat. tit. 11, § 11-22-107.2: Sellers of video services

A. Unless otherwise specifically prohibited by law, a seller of

video services may assess a late fee on delinquent accounts having

an unpaid balance of Twelve Dollars ($12.00) or more.

B. The seller of video services shall conspicuously disclose,

in the contract for service and on each statement or invoice, the

terms on which a late fee may be assessed by the seller including

the amount of the fee.

C. No late fee shall be assessed which exceeds Six Dollars

($6.00) or five percent (5%) of the unpaid amount, whichever is

greater.

D. Prior to collecting a late fee, the seller shall give notice

to the customer by first class mail to the customer's last known

billing address as shown on the records of the seller of the amount

of the delinquency at least ten (10) days prior to the date the fee

will be imposed. The notice shall conspicuously state the place and

address for making payment, the date on which the late fee will be

imposed, and the amount of the late fee.