Also called: ARN, Acquirer reference number
What an Acquirer Reference Number is
An Acquirer Reference Number (ARN) is a numeric identifier attached to a processed card transaction. It gives your acquirer, the card network and the customer’s issuing bank a shared reference for locating that transaction. ARNs are commonly 23 digits, though the exact format differs by network and bank.
An ARN identifies a transaction record. It does not reverse a charge, cancel a payment or prove by itself that a refund has reached the customer’s account. The term refers to a reference number, not to an acquiring bank.
An ARN helps a bank find a transaction; it does not move the money or settle a dispute.
How an ARN helps trace a payment
The acquirer generates the ARN as it processes the transaction. The number follows the payment through the card network so the customer’s bank can use it to search for the record. If a customer says a payment or refund is missing, sharing the correct ARN gives the bank a specific transaction to investigate.
A refund is a separate transaction and receives its own ARN. For example, the ARN for a refund will not be the same as the ARN for the original purchase. Giving a customer the purchase ARN when they need to trace a refund can send the bank to the wrong record.
Where to find an ARN
Look in the payment or refund details in your payment dashboard. The ARN may appear with the transaction’s processing activity or status. For a system integration, check the payment-action response or the event data your integration receives for a captured payment or refund.
The ARN may not be available as soon as you submit a refund because it is returned as the network processes that transaction. Confirm that the refund was processed before passing an ARN to the customer. Copy all digits exactly, since a mistyped number can lead the bank to a different record.
What it means for your business
An ARN is a tracing tool, not a fee or a way to speed up settlement. It does not itself change interchange, network assessments or your processor markup. The useful business impact is fewer support loops when a customer’s bank cannot locate a payment or refund.
Keep the ARN with the matching transaction record and distinguish purchase references from refund references. If a customer reports a missing refund, provide the refund’s ARN and its processed status so the customer can ask their bank to trace that specific credit. An ARN can support an inquiry, but it does not decide a chargeback or replace evidence in a dispute.
What you can actually change
- Copy every digit. Send the full ARN to the customer and identify it as the refund reference. A transposed digit can point the bank to another record.
- Confirm the status. Verify that the refund was processed before asking the customer’s bank to trace it. The ARN does not confirm that the credit has posted to the account.
Frequently asked questions
Is an ARN the same as an acquiring bank?
No. An ARN is a transaction reference number. An acquiring bank, also called an acquirer, processes card payments for your business. The acquirer generates the ARN as it processes a transaction.