N.J. Stat. § 40:63-94
The joint meeting acting on behalf and in the corporate names of the several municipalities jointly contracting with each other regarding the public improvement or works authorized to be jointly constructed under the provisions of this article, and represented in such joint meeting, may, in the joint names of all the contracting municipalities, enter into any and all contracts necessary or proper for providing, maintaining and operating the same, with such changes or alterations as may be found convenient or necessary in the progress of the work.
All contracts, subcontracts, bills, estimates, measurements and all payments of money, relating to or growing out of the public improvement or works hereby authorized, shall, before becoming effective or binding, be approved by a majority vote of such joint meeting, in like manner as in case of motions or resolutions referred to in section 40:63-87 of this title, except as therein provided.
N.J.S. § 40:63-94