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I have been studying about contactless payment specifications and protocols and I have few questions about them.

  1. Are ISO-14443 and ISO-18092 called NFC and RFID in general terms, or are they a subset or something else?

  2. If ISO-14443 is based on ISO-18092, then why isnt my debit card not detected by a NFC payment terminal?

  3. When multiple cards are presented at the terminal, then as per general wireless will the CSMA/CA happen, or bit collision method happens?

Thank you!

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