Salad in hand, Carol Lyn Brown walked up to the cashier at K Street Cafe and Bagel in Northwest Washington and handed over her credit card.
Erin Cullen, the cashier, didn’t run it through a traditional cash register. Instead, she swiped it through a small plastic attachment on her iPad — and within seconds the payment was processed. The receipt can be texted or e-mailed back to the customer.
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