Can tap-to-pay save public transportation?

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I vividly remember the first time I used my phone to ride the New York City subway. I tapped my device against the translucent rectangle thing, the light turned green, and the turnstile made a familiar click inviting me to push through the metal arms. On the other side, the future beckoned.

After a two-decade run as New York's preeminent pass to the su ...

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