Yes, you can seamlessly use a valid Costco membership card issued in the United States at any Costco warehouse location across Canada, as membership is universally recognized globally. However, when paying at the register or fuel pumps in Canadian warehouses, you must adhere to local payment rules, meaning that Costco Canada warehouses do not accept US-issued Visa or American Express credit cards. To make credit purchases, you must pay with a Mastercard, cash, debit card, or a physical Costco Shop Card, though US Mastercard credit cards issued by major American banks will process successfully.
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