Does Costco Use PayPal?

No. Costco says on its customer-service pages that it does not accept PayPal in its warehouses or on Costco.com. Costco instead lists specific accepted payment methods for warehouses, gas stations, and Costco.com orders.

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What Costco officially accepts

Costco separates payment methods by shopping surface. On its official payment page, Costco says U.S. warehouse locations accept all Visa cards, most PIN-based debit or ATM cards, Costco Shop Cards, cash, checks, EBT cards, and mobile payments such as Apple Pay, Google Pay, and Samsung Pay. For Costco.com, the listed methods include all Visa cards, the Costco Anywhere Visa Card by Citi, MasterCard, most PIN-based debit or ATM cards, Costco Shop Cards, Visa Click to Pay, and Affirm.

Where PayPal is excluded

The clearest current Costco statement appears on its fraud-prevention page, where Costco says fraudulent PayPal emails are not tied to real Costco orders and adds that Costco does not accept PayPal as a payment method in warehouses or on Costco.com. That is a stronger signal than simply not seeing a PayPal button at checkout.

Warehouse, gas station, and online rules are not identical

Costco surface	What the official page lists
U.S. warehouse	Visa, most PIN debit or ATM cards, Shop Cards, cash, checks, EBT, and mobile wallets.
U.S. gas station	Visa, most PIN debit or ATM cards, Shop Cards, and Apple Pay.
Costco.com	Visa, MasterCard, most PIN debit or ATM cards, Shop Cards, Visa Click to Pay, and Affirm.
PayPal	Not listed on the official payment page and explicitly rejected on Costco's fraud-prevention page.

Can you use your PayPal balance anyway?

Sometimes, indirectly. PayPal's official debit-card page says the PayPal Debit Mastercard can be used anywhere Mastercard is accepted, and PayPal's card agreement says the consumer debit card may be used for purchases at merchants that accept debit Mastercard. Since Costco.com officially accepts MasterCard online, a PayPal debit card may work there as a normal Mastercard payment method.

That does not turn PayPal checkout on at Costco. It is just using a PayPal-issued card over the Mastercard network where Costco accepts that network.

What about paying in a U.S. warehouse with a PayPal card?

Be careful here. Costco's warehouse payment page is Visa-focused for credit cards and separately allows most PIN-based debit or ATM cards plus mobile wallets. Costco does not publish a warehouse page saying "PayPal debit cards are accepted," so the practical reading is narrower than online: a PayPal-branded card is not the same thing as PayPal checkout, and warehouse acceptance depends on whether the card is processed through a method Costco accepts at that location.

What usually works better than trying to force PayPal

For Costco.com, use one of the methods Costco explicitly lists on its official payment page.
If you want to spend PayPal-held funds, check whether your PayPal-linked card product can ride an accepted card network for the exact Costco surface you are using.
If you are shopping in a warehouse, assume the published warehouse rules control, not the online rules.

What not to assume

Do not assume that because Costco takes Apple Pay or Google Pay, it also takes PayPal. Costco lists mobile wallets separately and explicitly says PayPal is not accepted. Also do not assume that a PayPal card will behave the same way in a warehouse, at a gas station, and on Costco.com. Costco's accepted methods differ by channel.

Bottom line: Costco does not use PayPal directly

The clean answer is no. Costco's official pages say PayPal is not accepted in warehouses or on Costco.com. If you want to use PayPal funds, the only realistic path is an indirect one through a PayPal-issued card that runs on an accepted network for the specific Costco checkout you are using.