Square CEO hints at Windows Phone app, says Starbucks funding will go toward 'international efforts'

As you probably have heard -- it's created quite some buzz, after all -- Starbucks just announced a partnership with Square to accept mobile payments via the Pay with the Square app. That's huge news for Square, which currently processes transactions for some 75,000 merchants, as the coffee retailer is one of the largest national chains to integrate with the payment service.

At a breakfast in New York today, Square CEO and Twitter founder Jack Dorsey and Starbucks CEO Howard Schultz fielded questions about the partnership's importance. While most of the talk centered on the rollout that will bring Square payments to 7,000 Starbucks stores ahead of the holiday season, the discussion also touched upon other areas of expansion for the mobile payments company.

Currently, the Pay with Square app is only available on iOS and Android. Asked whether a Windows Phone app is in the making, Dorsey said, "We will definitely build for where the users are, and we're excited about the Windows Phone interface." Take that as you will.

Starbucks will start accepting Square payments ahead of the holiday season, and Dorsey said the coffee retailer's $25 million investment will be used for hiring and to expand "international efforts." Starbucks, which has 18,000 stores in 60 countries, would certainly be a natural partner in any overseas plans.