No one, it seems, wants to miss the mobile payment revolution.
A new service — to be created jointly by Wal-Mart, Target and other retailers — could give customers an easier way to combine their digital wallet, instant coupons, gift cards and loyalty points in one app.
The announcement by retailers on Wednesday to create the Merchant Customer Exchange (MCX) is also a line in the sand drawn to remind banks, credit card companies, Google, wireless carriers and technology start-ups that they aren't about to give up....