What Is an ARN Number and How to Find It

A quick reference for merchants tracking refunds and fighting chargebacks.

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TL;DR

• ARN = Acquirer Reference Number: a unique ID that tracks a card transaction from the merchant's bank to the cardholder's bank.
• It's 23 digits long. Visa ARNs always start with a 2 or a 7.
• Generated by the payment gateway/acquirer — you don't apply for one, it's created automatically.
• Most useful for tracing refunds and supplying evidence in chargeback disputes.
• Fastest place to find it: your payment processor's dashboard, on a refunded transaction that's at least 3 days old.

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What is an ARN number?

An Acquirer Reference Number is a unique identifier assigned to a Visa or Mastercard card transaction. It acts as a bridge between the two banks involved in every card payment:

• Acquiring bank — the merchant's bank.
• Issuing bank — the cardholder's bank.

Because the ARN follows the money through the entire flow, any party can use it to trace, verify, and audit a specific transaction — which is exactly what you need when a payment goes sideways.

Key facts:

• Length: 23 digits (alphanumeric in some networks, numeric for Visa).
• Visa prefix: always begins with 2 or 7.
• Who creates it: the payment gateway / acquirer, automatically.
• When: typically at settlement — for refunds, it usually appears ~3 days after the refund is issued.
• Networks: applies to Visa and Mastercard credit/debit card transactions.

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ARN vs. Transaction ID (they are not the same)

A common mix-up. Quick distinction:

• Transaction ID — an internal reference used by a payment system (gateway, processor, your own DB) to identify a transaction within that system.
• ARN — a network-level reference the acquiring bank assigns so the transaction can be traced between banks, across the card network.

Rule of thumb: use the Transaction ID to find a payment in your tools; use the ARN when you need banks to talk to each other about it.

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What is an ARN used for?

• Tracing refunds. If a customer says "I never got my refund," the ARN lets either bank locate exactly where the money is in the pipeline.
• Chargeback disputes. Submit the ARN as evidence so the issuer can investigate and validate a transaction's legitimacy.
• Fraud investigation. A shared reference point for flagging and tracking suspicious or unauthorized transactions.
• Reconciliation at scale. A reliable per-transaction handle when you're managing high volume.
• Other money movement. Also used to verify electronic funds transfers and partial settlements.

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The refund status states you'll actually see

When you look for an ARN on a refund, the processor usually shows one of three states. Knowing them saves a support ticket:

• ARN not available → the refund completed before the original charge settled, so the authorization was simply reversed. No ARN is generated — this is normal.
• ARN processing → the refund is in flight but hasn't finished. Check back.
• ARN available → the number is ready to copy.

Takeaway: if there's no ARN, it's often because the refund happened too fast to need one — not because something broke.

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How to find an ARN number (step by step)

The universal recipe, regardless of platform:

1. Open your payment processor / gateway dashboard.
2. Go to Transactions → Refunds (or filter orders by refund status).
3. Pick a refund that is ≥ 3 days old and ≤ 120 days old.
4. Filter by card brand = Visa if you specifically need a Visa ARN.
5. Open the transaction and look in the payment breakdown / timeline for the ARN field.
6. Copy it — and sanity-check: 23 digits, starting with 2 or 7 for Visa.

Below are the two most common platforms.

Finding an ARN in Stripe

• Open your Stripe dashboard → Transactions tab → Refunds.
• Apply these filters:
  • Refunds issued at least 3 days ago (the ARN appears after this).
  • More filters → Card brand → Visa.
  • Date and time → is in the last → 120 days.
• Click a matching refund to open it.

• Find the ARN under the Payment breakdown section.

Finding an ARN in Shopify

• Log in to Shopify → Orders.
• In the search bar, type VISA to filter to Visa transactions.
• Apply a Payment status filter and select Refunded.
• Open a refunded order that's ≥ 3 days but ≤ 120 days old.

• Scroll to the order timeline — the ARN appears there.

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Other places to find an ARN (cardholder side)

If you're the customer — or helping one — the ARN usually lives in:

• Bank SMS / email transaction alerts.
• Net banking portal or mobile banking app transaction history.
• UPI / wallet app payment details (in markets where applicable).
• Customer support — call the bank or processor with the transaction date, amount, and last 4 digits.

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No refunds or Visa transactions yet? Generate an ARN

If your account is new and you have nothing to pull from:

1. Run a test transaction on your own store with your own Visa card.
2. Wait at least 3 days, then issue a refund (refunds newer than 3 days often won't show an ARN).
3. Check the refunded transaction 2–4 days later — the ARN should now appear in your processor.
4. Still nothing? Contact your processor and request the ARN for that specific refunded transaction.

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Faster path for validation (skip the ARN hunt)

Some services (e.g., alert/chargeback-prevention providers) need ARNs to validate your merchant profile — but usually accept an alternative:

• Provide your MCC, CAID, and BIN details instead.
• Get these from your payment processor's support team.
• This lets the provider skip ARN validation and move straight to enrollment.

Trade-off: supplying MCC/CAID/BIN directly is often faster than gathering three valid ARNs, since ARN validation can add extra business days.

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Troubleshooting cheatsheet

• "ARN not available" on a refund → likely reversed before settlement. Expected; no number exists.
• Refund is <3 days old → too early. Wait and re-check.
• Number isn't 23 digits / doesn't start with 2 or 7 → it's probably a Transaction ID or auth code, not a Visa ARN.
• Can't find the field anywhere → contact the processor with the date, amount, and last 4 digits and request the ARN.
• Transaction is >120 days old → some dashboards age it out; pull it via support instead.