In another sign that mobile payments are going mainstream, PayPal on Wednesday announced a deal with Discover that will expand PayPal’s footprint to 7 million merchants next year. Starting in April 2013, participating merchants who offer Discover will begin accepting payments from PayPal’s 113 million active users. In a press release, the companies said merchants won’t have to install or upgrade existing point-of-sale hardware and software to accept the payments. Instead, in-store signage will make customers aware of the capability. Read the full story at Mashable.