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The San Francisco start-up said today it’s up to $2 billion in annual payments processed and has activated 800,000 merchants for its payment system, up from half a million in May. And it’s made a key change in the way it process payments to appeal to larger merchants.

Square readies for battle with PayPal — Tech News and Analysis

Go Square.  Went to a craft fair and half the merchants were all using Square.  It’s just one of those ideas/approaches that just takes the world by storm.