Michigan Compiled Laws, Chapter 445. Trade and Commerce § 445.1857

Sec. 7. (1) In addition to the interest or finance charges that are authorized under section 4,  1 a depository institution may charge, collect, and receive from a borrower or buyer all fees and charges that are agreed to or accepted by the borrower or buyer including those relating to making, closing, processing, disbursing, extending, committing to extend, readjusting, renewing, collecting payments upon, or otherwise servicing an extension of credit or any occurrence or transaction related to an extension of credit.

(2) For any credit card arrangement, all fees and charges allowed by this section are considered interest.

(3) A depository institution shall not require a borrower or buyer to pay an excessive fee or charge.