Mastercard Reason Code 4837

What is

Mastercard Reason Code 4837

?

The cardholder says they never authorized this card-not-present purchase at all.

Why this happens

Someone other than the cardholder used stolen card details to place an online or phone order.

What this means for each merchant

The most common fraud dispute e-commerce merchants see — AVS/CVV match and delivery-address verification are central.

Evidence that typicalls wins this

AVS/CVV match results, device/IP data, and delivery confirmation to a verified address.

How to fight it

Submit AVS/CVV match proof, device/IP consistency data, and delivery confirmation to the cardholder's known address.

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Common mistakes

Shipping to an unverified address without AVS/CVV match or extra review.

How to prevent it

Enforce AVS/CVV matching and flag address mismatches for manual review before fulfillment.

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