Mastercard is the only credit card that can be used at Costco ... Since then, American Express cards have not been accepted at Costco, either in-store or online. Can I Use Debit Cards or Mobile ...

Disadvantages of traveler's checks: Some merchants may not accept them. They lack the benefits and perks of travel rewards credit cards. Now that credit cards are widely accepted, you can use them ...

Discover credit cards are accepted nationwide at around 99% of places that accept credit cards, according to Discover's website. But that wasn't always the case. In fact, not too long ago, it wasn ...