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"Secure Element"

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Diagram of ISO 8583 Field 2 (F2) card number structure

ISO 8583

ISO 8583 Field Descriptions (F2)

F2 is the Card Number field in ISO 8583, identifying the cardholder and issuing bank. This post covers its structure, the 8-digit BIN update, field format, first-digit scheme identification, and PCI DSS security requirements.