§12A-2-507.

§12A-2-507.
   
   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.