The sale of gift certificates, premium stamps and similar documents, as well as their redemption are not subject to tax. When the owner of a gift certificate redeems the gift certificate, etc., or a part thereof, for tangible personal property, sales tax is due on the total selling price of the tangible personal property. For example, if the owner of a gift certificate valued at $100 purchases a $25 item, tax must be computed on $25, must be collected, reported and remitted by the vendor.
Okla. Admin. Code § 710:65-19-126