Ga. Code § 20-3-171
Bonds of the authority shall be confirmed and validated in accordance with the procedure of Article 3 of Chapter 82 of Title 36. The petition for validation shall also make party defendant to such action any authority, subdivision, instrumentality, or agency of the state which has contracted with the authority for the use of any building, structure, or facilities for which bonds have been issued and sought to be validated; and such other authority, subdivision, instrumentality, or agency shall be required to show cause, if any, why such contract or contracts and the terms and conditions thereof should not be inquired into by the court, the validity of the terms thereof determined, and the contract adjudicated as security for the payment of any such bonds of the authority. The bonds, when validated, and the judgment of validation with respect to such bonds shall be final and conclusive against the authority issuing them and against any other authority, subdivision, instrumentality, or agency contracting with the authority.
OCGA § 20-3-171