N.J. Stat. § 40A:9-28.5
A county finance officer certificate may be issued without fee by the director to any employee of the Division of Local Government Services for the sole purpose of enabling that employee to serve as a chief financial officer on an interim basis in any county when so instructed by the director.
When an employee of the director is instructed to serve as a chief financial officer for a county on an interim basis, the director may establish a fee for the service based upon the time spent and other expenses for the work. The county, upon request for payment for chief financial officer services, shall forward a check to the director, payable to the State Treasurer. The amount, if not paid when billed, shall be recoverable in an action at law.
N.J.S. § 40A:9-28.5