Mastercard reason code 4834
Mastercard 4834: Point-of-Interaction Error (Duplicate / Incorrect Amount)
What the cardholder is claiming
The cardholder says they were charged twice, or the amount differs from what they agreed to.
The evidence that actually wins
Bank analysts skim responses in minutes against a checklist for this exact code. Lead with the strongest fact; never make them dig.
- ✓Authorization records showing the charges are distinct purchases (different items, timestamps, receipts)
- ✓The receipt or checkout record matching the charged amount
- ✓If it genuinely duplicated: the refund you issued when you noticed
The honest read
If it really was a duplicate, refund immediately; that is not a fight, it is an error. If the charges are legitimately separate, itemized receipts almost always carry it.
Nobody can promise you a win; the cardholder's bank decides. What you control is submitting the strongest complete case your records support, on time. Our plain-language guarantees say exactly what that means.
Fighting a 4834 right now?
Send us the dispute and a person builds the complete, submission-ready response: the narrative mapped to 4834, your evidence compiled and ordered, and the field-by-field walkthrough. 24-hour rush available. If our review says yours isn't worth fighting, we tell you for free.