A written confirmation required under section 223.177, subdivision 2, and a written voluntary extension of credit contract must include those items prescribed by the commissioner by rule. A contract shall include a statement of the legal and financial responsibilities of grain buyers and sellers established in this chapter. A contract shall also include the following statement in not less than ten point, all capital type, framed in a box with space provided for the seller's signature: "THIS CONTRACT CONSTITUTES A VOLUNTARY EXTENSION OF CREDIT. THIS CONTRACT IS NOT COVERED BY ANY GRAIN BUYER'S BOND." If a written contract is provided at the time the grain is delivered to the grain buyer, the seller shall sign the contract in the space provided beneath the statement. A transaction that does not meet the provisions of a voluntary extension of credit, including the issuance and signing of a voluntary extension of credit contract, is a cash sale.