Mastercard 4837: No Cardholder Authorization

What this code means

The cardholder states they did not authorise the transaction. It covers both genuine third-party fraud and friendly fraud where the cardholder has forgotten or is disputing in bad faith.

The evidence that answers it is close to that for Visa 10.4, so if you handle both networks, one internal process usually covers both codes.

Evidence commonly relevant

• AVS and CVV or CVC resultsFull matches on both are meaningful signals that the transacting party held the card.
• Authentication data where available3D Secure or equivalent results, which may shift liability.
• Device, IP, and account historyEspecially prior undisputed orders from the same customer profile.
• Delivery to the billing addressWith a signature where the value justifies one.
• Any cardholder contact after the transactionCorrespondence that shows the cardholder engaged with the order.

Where these cases commonly fall down

• No authentication and no prior history, which leaves very little to argue from.
• Delivery to an unverified address.
• Digital delivery with only a login or download record.
• High-value first orders, which attract more scrutiny in both directions.

Response considerations

• Check the authentication status before anything else, as it may determine whether contesting is worthwhile at all.
• Present the identity signals as a set. Individually they are weak and collectively they are much stronger.
• Where the same cardholder has a history of undisputed orders with you, lead with it.

How ChargebackDossier handles this code

Selecting Mastercard 4837 on a case loads the response strategy and the evidence types associated with it, and sets a response deadline from the representment window. As you upload documents they are filed into the twelve evidence categories the dossier is indexed by, and the case strength score reports which of the expected evidence types are still missing for this specific code.

When the file is ready, the case review reads what you have actually uploaded and writes back the gaps, and the response letter is drafted around those exhibits by name. Both export as PDFs alongside the indexed evidence dossier.