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Whether you're shopping online at Gap, Athleta, Banana Republic, or another store, you can definitely use a cash back credit card. Although when you shop online or in a store, you are hit with heavy advertising for the store credit card, plus plenty of sales that are only good with the store card, it is not always a great idea to apply for the store credit card. Especially online, there are plenty of ways to double or even triple your rewards if you use your cash back credit card to make purchases. In fact, you can use a travel rewards card, a hotel loyalty credit card, or any other kind of card you prefer when you shop online. Just make sure you are securely logged into a password-protected, encrypted site, and that you don’t accidentally reveal any sensitive personal payment information on a site that isn’t trustworthy and official.