Mo. Rev. Stat. § 173.365
Four members of the authority shall constitute a quorum for the purpose of conducting business and exercising the powers of the authority. Action may be taken by the authority upon the affirmative vote of at least four of its members. Members may participate in a meeting by means of conference telephone or similar communications equipment whereby all persons participating in or attending the meeting can communicate with each other, and participation in a meeting in this manner shall constitute presence in person at the meeting for all purposes. Each meeting of the authority for any purpose whatsoever shall be open to the public. Notice of meetings shall be given as provided in the bylaws of the authority. The proceedings and actions of the authority shall comply with all statutory requirements respecting the conduct of public business by a public agency. Members of the authority shall receive no compensation for services but shall be entitled to reimbursement for necessary expenses, including traveling and lodging expenses, incurred in the discharge of their duties. Any payment for expenses shall be paid from funds of the authority.
§ 173.365, RSMo