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you can use a Mastercard or Discover card at Costco.com and via the Costco app. If you prefer to shop in-store at Costco with a credit card, then make sure you have a Visa-backed credit card.
If you need to make a last-minute run to the grocery store to pick up something for your holiday gathering, Costco will be an option for you this year, as the company's warehouses will be open ...