Capital One and Discover completed their merger on May 18. Discover what financial professionals say you should do to keep your money secure.

Many banks, including Capital One, stopped offering debit card rewards after the Durbin amendment to the Dodd-Frank Act of 2010 placed a cap on interchange fees – often called swipe fees – that banks can charge merchants for debit card transactions. This cut into the banks' revenues, and many adjusted by eliminating rewards.

Capital One finalized its $35.3 billion purchase of Discover on Sunday, completing a credit card mega-merger announced more than a year ago. Nothing will immediately change for Discover customers, according to a press release issued Sunday by Capital One.