Contactless cards do not send your card number.
They use NFC encrypted token systems.
Inside your card or phone is a tiny NFC antenna and secure chip.
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When you tap near a terminal, a short-range radio field powers the chip.
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The chip generates a one-time encrypted token instead of your real card number.
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This token is sent to the payment network and verified by your bank.
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Once used, the token becomes useless.
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Your real card number is never exposed.
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You are paying with disposable cryptographic proof.
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