Square checkout systems can now have custom interfaces

If you’re a regular at a coffee shop or some other small business that uses Square’s checkout system, you’ve seen the same gray-and-white screens — tip, signature, receipt — over and over and over. But today, Square is opening up the ability for developers to create brand-new interfaces for Square’s payment system to be attached to so that businesses don’t all have to use the exact same app.
That means, eventually, your local coffee shop could end up wi