Okla. Stat. tit. 68, § 1505

For the purpose of the decal issued under Sections 1501 et seq. of this title, the fee year shall begin on the first day of July and end on the last day of the following June; and shall be divided into two (2) halves. The Tax Commission shall in each instance issue decals for the remainder of the fee year upon payment of the fee on the basis of the current and remaining half of such fee year. Any product purchased for resale, through a vending machine where fees have been paid and decals affixed, shall not be subject to sales tax.