In administering the flood insurance program under this subchapter, the Administrator is authorized to enter into any contracts, agreements, or other appropriate arrangements which may, from time to time, be necessary for the purpose of utilizing, on such terms and conditions as may be agreed upon, the facilities and services of any insurance companies or other insurers, insurance agents and brokers, or insurance adjustment organizations; and such contracts, agreements, or arrangements may include provision for payment of applicable operating costs and allowances for such facilities and services as set forth in the schedules prescribed under section 4018 of this title.