Okla. Stat. tit. 12A, § 12A-4A-504: Order in which items and payment orders may be charged

to account; order of withdrawals from account.

ORDER IN WHICH ITEMS AND PAYMENT ORDERS MAY BE CHARGED TO

ACCOUNT; ORDER OF WITHDRAWALS FROM ACCOUNT

(a) If a receiving bank has received more than one payment

order of the sender or one or more payment orders and other items

that are payable from the sender's account, the bank may charge the

sender's account with respect to the various orders and items in any

sequence.

(b) In determining whether a credit to an account has been

withdrawn by the holder of the account or applied to a debt of the

holder of the account, credits first made to the account are first

withdrawn or applied.