All accounts, claims and demands against the city shall be fully and completely itemized with date and character of item and by whose order or at whose instance or upon what contract the supplies were furnished or labor performed. Such accounts and claims shall be written upon or attached to vouchers furnished by the city, to which shall be annexed for the signature of claimant, his bookkeeper or agent, a certificate in the following form:
I, , certify that the foregoing account is true and correct as to each and every item thereof; that the prices charged are reasonable; that no part of the said account has been paid, and the above amount is due after allowing all just credits and offsets.
(Prior code § 2-5-1)