Cube has launched their Windows Phone 8 and Windows 8 apps this month and it too is currently available to download. Cube is a similar service to Square but they of decided to go wider in their support by embracing Windows Phone and Windows 8 (yes, you can even use it on your Surface).
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Pick up Cube here in the Windows Phone Store or if on Windows 8, you can get that app here. You can learn more about Cube and their pricing from their website: getcube.com