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Re:Payments Startup Balanced (YC W11) Is Processing $370M a ... by acchow on Thursday January 16, 2014 @08:32PM (#7073726)
Square has an API to access data:

https://connect.squareup.com

Re:Payments Startup Balanced (YC W11) Is Processing $370M a ... by icelancer on Thursday January 16, 2014 @08:43PM (#7073765)
But not to charge cards.