(A) No contract of a municipality is valid unless the contract has be authorized by a vote of the governing body at a duly assembled meeting thereof.
(B) Each written contract shall be executed in the name of the municipality by the mayor or president of the board of trustees, be countersigned by the auditor or clerk, and have the corporate seal attached. However the governing body of a municipality may, by ordinance or resolution, delegate to any employee of the municipality the authority to enter in to a contract on behalf of the municipality and to execute the contract and any other instrument necessary or convenient for the performance of the contract subject to the limitations delegated by the governing body.
(SDCL § 9-1-5)