I think it's really important to hold back and implement this slowly. That was one of the most important decisions we made.

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If you touch your card to the fare vendor to start the transaction, put $20 in and then forget to close the transaction by putting the card within 3 inches of the target, the system will automatically take note of your mistake and send you a fare credit of $20 to add to your card. So basically what we've got is a very customer-friendly, highly secure, very flexible, very convenient system.

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