W. Va. Code § 17A-6D-17: Authorized administrative fees.

(a) As used in this section, “administrative fees” means reasonable costs expressly provided for in the master rental agreement pertaining to parking tickets, tolls, citations for other non-moving violations, and other costs incurred by the rental customer and not timely paid by the rental customer and paid by the daily passenger car rental company. Administrative fees may not exceed $25 per rental agreement or ten percent of the debt owed, whichever is less.

(b) Notwithstanding any provision of this code to the contrary, including, but not limited to §46A-2-128(d) of this code, a daily passenger rental car company may collect or charge administrative fees incidental to, or arising from, the rental transaction when the administrative fees are expressly provided for in the master rental agreement and affirmatively acknowledged by the rental customer.