Capital One Financial Corporation plans to acquire Discover Financial Services in a $35 billion deal that would combine two of the largest U.S. credit card companies. Today on the show, five big questions about the deal, and the opaque system behind every swipe, tap or insertion of your credit card.

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Planet Money's TikTok on the secret behind credit card rewards

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Tags: mergers  credit cards  The Indicator  capital one  Discover Financial Services