W. Va. Code § 60-3-20: Sales, mode of payment.

The sale of alcoholic liquors in state stores and in state agencies shall be for cash, money order, certified check, cashier's check or traveler's check only. In the case of private clubs as defined in article seven of this chapter, letters of credit from banks guaranteeing payment of checks may be filed with the commissioner. Filing of such letters may permit the commissioner to accept the club's check.