Raising fees on small-ticket debit purchases could hurt self-service kiosks, such as DVD rental kiosks, which "benefit from debit-card acceptance, " Mr. McCrohan wrote.

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At the ticket machine, I slid in my debit card, punched up the route and chose a day return.

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Nexus has so far upgraded 52 Metro stations with smart ticket machines which are capable of accepting credit and debit cards and banks notes, as well as coins.

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