Application PAN Sequence Number

What it is

Distinguishes multiple cards sharing one PAN (EMV tag 5F34 value) — e.g. primary and supplementary chips.

Specification reference

Defined in ISO 8583:1987 (base). Card networks publish their own dialect tables (Visa BASE I / V.I.P., Mastercard CIS) that refine formats, lengths, and — for private-use elements — the entire layout. Always confirm against the interface specification you implement.

Decode & build this element