As discussed, Sales Tax is calculated on "Gross Receipts" or "Gross Proceeds." Given that, this language from the Tax Commission seems to answer the original question:
(c) Excluded items and transactions. "gross receipts", "gross proceeds", or "sales price" shall not include: (1) Discounts, including cash, term, or coupons that are not reimbursed by a third party that are allowed by a seller and taken by a purchaser on a sale.
https://www.ok.gov/tax/documents/rule6509.pdf (see top of page 10)
So the retailer cannot give a $50 discount on a $100 item, and then compute Sales Tax on the original list price of $100.
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