Wyo. Stat. § 16-6-602: Payment of agency accounts; interest.

Except as provided by contract, any agency which purchases or procures goods and services from a nongovernmental entity shall pay the amount due within forty-five (45) days after receipt of a correct notice of amount due for the goods or services provided or shall pay interest from the forty-fifth day at the rate of one and one-half percent (1 1/2%) per month on the unpaid balance until the account is paid in full, unless a good faith dispute exists as to the agency's obligation to pay all or a portion of the account.