1. In any suit, action or proceeding involving the validity or enforcement of or relating to any contract of an authority or other public body, such authority or other public body shall be conclusively deemed to have become established and authorized to transact business and exercise its powers hereunder upon proof of the adoption of the appropriate resolution or ordinance prescribed in section 100.320 above. Each such resolution or ordinance shall be deemed sufficient if it authorized the exercise of powers hereunder by the authority or other public body and finds in substantially the terms provided in subdivision (2) of section 100.320, no further detail being necessary, that the conditions therein enumerated exist.

2. A copy of such resolution or ordinance duly certified by the municipal or county clerk, as the case may be, shall be admissible in evidence in any suit, action or proceeding.