What is an ARN (Acquirer Reference Number)? And why it matters for your business

An Acquirer Reference Number (ARN) is a unique, network-level identifier assigned to credit and debit card transactions that allows payments, refunds, and transfers to be traced across merchants, payment processors, acquiring banks, and card issuers. Unlike internal transaction or order IDs, it is recognized throughout the card-payment network, making it useful for investigating delayed refunds, responding to customer inquiries, resolving disputes, and providing evidence in chargeback cases. Merchants can generally locate ARNs in payment gateway or merchant dashboards, including Airwallex’s payment details pages, or request them from their processors or acquiring banks, while customers may provide an ARN to their bank to trace a transaction. The number is typically generated after processing, often within hours, and is presented as a tool that can improve payment transparency, speed issue resolution, and strengthen customer confidence.

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