Mich. Comp. Laws § 339.5817

Sec. 817. A mechanical contractor that is licensed under this article and performs work in a municipality shall register his or her license with the enforcing agency that issues permits and provides inspection services of mechanical contractor's work for that municipality. A registration under this section is valid until the expiration date of the mechanical contractor's license. A municipality shall grant registration to a mechanical contractor under this section if the mechanical contractor is licensed under this act and pays a fee established by the municipality in an amount that does not exceed $15.00.