Processing Errors
12.4 Incorrect Account Number
Details
Visa reason code 12.4 is issued when a transaction is processed to the wrong account number—meaning the cardholder was charged, but the charge was intended for a different customer. This typically occurs due to manual keying errors, duplicate card records, or a mix-up at the point of sale or during data entry.
Even if the cardholder received the product or service, a mismatch between the intended and charged account can result in a chargeback. Merchants must ensure that transactions are submitted with accurate account details to avoid liability.
Timing to raise the dispute (Issuer/Cardholder)
Timing to respond to the dispute (Acquirer/Merchant)
How to respond?
If the account number was entered correctly or the cardholder received the goods/services, submit documentation to support your case:
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Provide terminal or system logs confirming the correct account number was used
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Include receipts, delivery records, or customer correspondence showing fulfillment of the order
How to prevent?
Protect against account number errors with accurate systems and careful workflows:
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Use chip or contactless readers to reduce manual entry and keying mistakes
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Reconcile transaction records regularly to catch misapplied charges quickly