![]() Longitudinal redundancy check (LRC) - it is one character and a validity character calculated from other data on the track.End sentinel - one character (generally '?').Discretionary data - may include Pin Verification Key Indicator (PVKI, 1 character), PIN Verification Value (PVV, 4 characters), Card Verification Value or Card Verification Code (CVV or CVK, 3 characters).Expiration date - four characters in the form YYMM. ![]()
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