Wis. Stat. § 14.39

Before actually filing any document by making an endorsement on that document, the secretary of state may accept and deposit the filing fee submitted with that document upon the condition that if subsequent examination of the document establishes that it does not meet the requirements for filing, the fee may be refunded and upon the condition that if a discrepancy in the amount of the fee is subsequently discovered the secretary of state may then demand further payment of a shortage or refund an overpayment subject to s. 20.905 (3).