The NY Times:

Starbucks is also investing $25 million in Square as part of its latest round of financing, which values the company at $3.25 billion, and Howard D. Schultz, Starbucks’s chief executive, will join Square’s board. Starbucks has offered its own mobile payment app since last year and processes more than a million mobile payments a week. Customers will continue to be able to use it, but they will also be able to use Pay With Square, Square’s cellphone app, which eliminates even having to take the phone out of your pocket or sign a receipt.