Okla. Stat. tit. 18, § 18-1044: Payment for Stock Not Paid in Full

PAYMENT FOR STOCK NOT PAID IN FULL

The capital stock of a corporation shall be paid for in such

amounts and at such times as the directors may require. The

directors, from time to time, may demand payment, in respect of each

share of stock not fully paid, of such sum of money as the

necessities of the business, in the judgment of the board of

directors, may require, not exceeding in the whole the balance

remaining unpaid on such stock, and such sum so demanded shall be

paid to the corporation at such times and by such installments as

the directors shall direct. The directors shall give written notice

of the time and place of such payments, which notice shall be mailed

at least thirty (30) days before the time for such payment, to each

holder of or subscriber for stock which is not fully paid at his

last-known post office address.