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STAN vs RRN: What's the Difference?
Both are "transaction numbers" and beginners mix them up. In short: STAN is a short-term, same-day trace number; RRN is a long-term, cross-system tracking reference.
| STAN (DE11) | RRN (DE37) |
|---|
| Full name | System Trace Audit Number | Retrieval Reference Number |
| Length | 6 digits | 12 chars |
| Set by | Originator (terminal/acquirer) | Acquirer |
| Uniqueness | Unique within a day/host | Longer-lived, cross-system |
| Main use | Match reversal/response to this txn | Refund/query/reconciliation reference |
Remember: STAN is like "today's queue number" (valid for the day, matches responses/reversals); RRN is like a "tracking number" (used long-term to retrieve the transaction across systems).
π Related: ISO 8583 field reference (DE11 / DE37).