MasterCard Labs has worked for eight months to bring together new technology from hardware manufacturer Samsung, grocery chain stores Fresh Direct and ShopRite, and its own online shopping cart app — for a refrigerator. Samsung’s Family Hub refrigerator will launch in the U.S. in May. It contains a 21.5-inch screen built into the door. MasterCard engineers in Dublin, Ireland, developed the multimerchant, integrated shopping cart app and a companion mobile app that will let users contact Fresh Direct and ShopRite with a list of groceries they want to buy. MasterCard will sign additional gro...