Payment puzzle · Put it in order · Medium

Can you put the steps of a chip payment in the order the card and terminal run them?

Put the steps in order: only what depends on what matters. Free, no sign-up.

Mission

A chip card is inserted and the payment goes online. Put the terminal’s steps in the order EMV runs them. Some steps may swap places: only what depends on what matters.

  • Start up
  • Checks (any order)
  • Decide
  • Go online

Your cards · tap one to place it in the next free slot

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All puzzles and what they teach

  1. Route the payment

    Chip at the counterWarm-up

    Can you get a chip payment from the counter to the card’s bank?

    PlayRead: ISO 8583 Protocol

  2. Route the payment

    Verify the chipMedium

    Can you deliver a chip’s cryptogram to the only system able to check it?

    PlayRead: NFC in Payments

  3. Route the payment

    Tap with a phoneMedium

    Can you get a phone tap approved by a bank that has never seen the phone’s card number?

    PlayRead: Payment Tokenization

  4. Route the payment

    Online PINHard

    Can you get an encrypted PIN to the issuer without anyone reading it on the way?

    PlayRead: TR-31 & TR-34 Key Standards

  5. Route the payment

    Checkout with 3-D SecureExpert

    Can you authenticate and authorize an online payment in the right order?

    PlayRead: 3D Secure (EMV 3DS)

  6. Put it in order

    Chip transaction, step by stepMedium

    Can you put the steps of a chip payment in the order the card and terminal run them?

    PlayRead: EMV Contactless Kernels 2–8

  7. Set the bits

    Read the TVRMedium

    Can you set the TVR bits that record what the terminal found?

    PlayRead: EMV Contactless Kernels 2–8

  8. Diagnose

    Diagnose the declineHard

    Can you find the root cause of three real-world payment failures from the logs?

    PlayRead: ISO 8583 Protocol