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A comment on Japan facing credit card number shortage. Parent comment
When possible some more complex key/token is passed, maybe via nfc, or some other mechanism.
When not possible, a 4x4 number is generated and challenge/response is required to confirm intent before approving the spend.
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When possible some more complex key/token is passed, maybe via nfc, or some other mechanism.
When not possible, a 4x4 number is generated and challenge/response is required to confirm intent before approving the spend.