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by takeda64 4783 days ago
AmEx has special Costco card, which you can only use with valid Costco membership (it automatically renews it per year) and the cashback you are receiving will be in a form of coupon given yearly which you can only spend back at Costco.
1 comments

You can cash the check at the customer service desk. But yes, you can only redeem the cash-back coupon at Costco.