Okla. Stat. tit. 14A, § 14A-2-309

(1) In the case of a transaction in which a mortgage, deed of

trust, purchase money security interest arising under an installment

sales contract, or equivalent consensual security interest is

created or retained in the buyer's principal dwelling to finance the

acquisition or initial construction of that dwelling, if that

transaction is also subject to the Real Estate Settlement Procedures

Act, 12 U.S.C. Sections 2601 et seq., good faith estimates of the

disclosures required by this part shall be made in accordance with

the rules of the Administrator concerning estimates before the

credit is extended, or shall be delivered or placed in the mail not

later than three (3) business days after the seller receives the

buyer's written application, whichever is earlier. If the

disclosure statement furnished within three (3) days of the written

application contains an annual percentage rate which is subsequently

rendered inaccurate within the meaning of Section 2-304(5) (a) and

(c), the seller shall furnish another statement at the time of

settlement or consummation.

(2) If a consumer credit sale is one of a series of consumer

credit sales transactions made pursuant to an agreement providing

for the addition of the deferred payment price of that sale to an

existing outstanding balance, and the buyer has approved in writing

both the annual percentage rate or rates and the method of computing

the finance charge or charges, and the seller retains no security

interest in any property as to which payments aggregating the amount

of the sales price including any finance charges attributable

thereto have been received, the disclosure required under this part

for the particular sale may be made at any time not later than the

date the first payment for that sale is due. For the purpose of

this subsection, in the case of items purchased on different dates,

the first purchased shall be deemed first paid for, and in the case

of items purchased on the same date, the lowest priced shall be

deemed first paid for.