Mo. Rev. Stat. § 431.020
Current with changes from the 2023 Legislative Session
All instruments of writing made and signed by any person or his agent, whereby he shall promise to pay to any other, or his order, or unto bearer, any sum of money or property therein mentioned, shall import a consideration, and be due and payable as therein specified.
§ 431.020, RSMo
RSMo 1939 § 3345