Ala. Code § 39-7-23
Bonds of an authority shall be authorized by resolution of the board of trustees of such authority and may be issued in one or more series, may bear such date or dates, mature at such time or times not exceeding 40 years from their respective dates, bear interest at such rate or rates, payable semiannually, be in such denominations, be in such form, either coupon or registered, be executed in such manner, be payable in such medium of payment, at such place or places, be subject to such terms of redemption, with or without premium, and be subject to being declared or becoming due before the maturity date thereof as such resolution or resolutions may provide. Said bonds may be issued for money or property, either at public or private sale, and for such price or prices as such authority shall determine. Pending the preparation or execution of definitive bonds, interim receipts or certificates or temporary bonds may be delivered to the purchaser or purchasers of said bonds. Said bonds may, with the consent of the holder thereof, be purchased by such authority out of any funds available for such purpose, and all bonds so purchased shall be cancelled. Said bonds shall be construed to constitute negotiable instruments even though payable from a specified source.
Ala. Code § 39-7-23 (1975)