Okla. Stat. tit. 14A, § 14A-2-409: Debt secured by cross-collateral

(1) If debts arising from two or more consumer credit sales,

other than sales pursuant to a revolving charge account, are secured

by cross-collateral (Section 2-408) or consolidated into one debt

payable on a single schedule of payments, and the debt is secured by

security interests taken with respect to one or more of the sales,

payments received by the seller after the taking of the cross-

collateral or the consolidation are deemed, for the purpose of

determining the amount of the debt secured by the various security

interests, to have been first applied to the payment of the debts

arising from the sales first made. To the extent debts are paid

according to this section, security interests in items of property

terminate as the debts originally incurred with respect to each item

is paid.

(2) Payments received by the seller upon a revolving charge

account are deemed, for the purpose of determining the amount of the

debt secured by the various security interests, to have been applied

first to the payment of credit service charges in the order of their

entry to the account and then to the payment of debts in the order

in which the entries to the account showing the debts were made.

(3) If the debts consolidated arose from two or more sales made

on the same day, payments received by the seller are deemed, for the

purpose of determining the amount of the debt secured by the various

security interests, to have been applied first to the payment of the

smallest debt.