All claims against the City of Cushing shall be itemized, verified under oath and filed with the city clerk, and approved by the board of commissioners before being paid, and all bills and claims shall be paid by warrant drawn on the city treasurer, which shall be signed by the chairman of the board of commissioners and attested by the city clerk, and any claims which are not filed within six (6) months from the date of becoming due, shall be outlawed, and shall not be of any force and effect.