Okla. Stat. tit. 11, § 11-22-138: Municipal collection agency contracts

A. The governing body of a municipality may enter into a

contract with a collection agency for the provision of collection

services for one or more of the following items:

1. Debts and accounts receivable including, but not limited to,

unpaid fees, penalties, interest, and other sums due the

municipality, as applicable; or

2. Court penalties, costs, fines and fees in cases in municipal

court in which the accused has failed to appear or otherwise failed

to satisfy a monetary obligation ordered by the court.

B. A governing body of a municipality that enters into a

contract with a collection agency pursuant to this section may

authorize the addition of a collection fee in an amount not to

exceed thirty-five percent (35%) on each item described in

subsection A of this section that has been referred by the

municipality to the collection agency for collection. If a

municipality enters into such contract with a collection agency and

authorizes the collection fee, the court shall order defendants to

reimburse the fee arising pursuant to paragraph 2 of subsection A of

this section and such court-ordered fee may be collected as provided

by law for the collection of any other civil debt or criminal

action.