Ala. Code § 22-34-9
In anticipation of the issuance of bonds, the authority may borrow such sums as may be needed for any of the aforesaid purposes and to obligate itself by certificate or promissory note, bearing interest at a rate or rates to be specified by the authority, and maturing within 18 months from the date of such certificate or promissory note. Such certificates or promissory notes shall be payable solely from the proceeds of the bonds of the authority and from the funds from which such bonds are payable. In the event that authority funds are not available for a loan for a project when application is made, in order to accelerate the completion of any project, the public body may, with the approval of the authority, obligate such public body to provide local funds to pay that portion of the cost of the project which the authority will make available by loan, and the authority shall refund the amount expended on its behalf by such public body.
Ala. Code § 22-34-9 (1975)