2 articles with this tag
The ABECS Pinpad Protocol: Brazil's POS Command Language
Every card payment in Brazil passes through a pinpad speaking the ABECS protocol — a command/response state machine with its own open, get-card, go-on-chip, get-PIN, and close commands. A structural guide to how the automation talks to the secure device, why the Input/Output split exists, and where the EMV flow you know lives inside it.
PIX, BR Code, and the EMVCo MPM: The QR All of Brazil Uses
The QR code that moved a country onto instant payments is EMV wearing a disguise. A field-by-field decode of a real PIX BR Code — the EMVCo Merchant-Presented Mode structure, the CRC16, static versus dynamic — and why the same TLV discipline from chip cards prints on a napkin.
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