Okla. Stat. tit. 12A, § 12A-2-507: Effect of Seller's Tender; Delivery on Condition

1) Tender of delivery is a condition to the buyer's duty to

accept the goods and, unless otherwise agreed, to his duty to pay

for them. Tender entitles the seller to acceptance of the goods and

to payment according to the contract.

(2) Where payment is due and demanded on the delivery to the

buyer of goods or documents of title, his right as against the

seller to retain or dispose of them is conditional upon his making

the payment due.