Okla. Stat. tit. 12A, § 12A-2-511: Tender of Payment by Buyer; Payment by Check

Tender of Payment by Buyer; Payment by Check.

(1) Unless otherwise agreed tender of payment is a condition to

the seller's duty to tender and complete any delivery.

(2) Tender of payment is sufficient when made by any means or

in any manner current in the ordinary course of business unless the

seller demands payment in legal tender and gives any extension of

time reasonably necessary to procure it.

(3) Subject to the provisions of this act on the effect of an

instrument on an obligation (Section 3-310), payment by check is

conditional and is defeated as between the parties by dishonor of

the check on due presentment.