Credit Cards: U.S. Costco warehouses accept Visa credit cards, while Costco.com accepts Visa and Mastercard. Debit Cards: Most PIN-based debit/ATM cards are accepted both in warehouses and online. Mobile Payments: Costco warehouses accept Apple Pay, Google Pay and Samsung Pay. Costco Gas Stations accept Apple Pay but have more limited payment options. EBT: EBT cards are accepted at U.S. Costco warehouses for eligible purchases; they are not listed among Costco.com payment methods. Financing: Affirm is available for eligible Costco.com purchases. It is not a general warehouse payment method.