Square, a futuristic payments company, is rolling out an old-school plastic debit card

As Silicon Valley looks towards a cashless, card-less future, Square's latest move is a bit of a throwback.
The mobile payment company is launching a debit card — or rather, a prepaid balance card — that connects to the company's app rather than a bank account, Recode first reported.
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The slick, all-black Visa gives customers a new way to unload the balance accrued from exchanges within Square's money-transfer service. 
It also lets hol