Mastercard codes sit in the 48xx series, with legacy two-digit codes (08-78) that map onto the modern 48xx reasons. Fraud codes such as 4837 and authorization codes such as 4808 carry 90-120 day windows, and the umbrella consumer code 4853 pairs with a sub-reason that determines the exact evidence required.
Find the code from your dispute notice below and open it to see what the code means, the response strategy for its dispute category, the evidence checklist to gather, and the evidence window you have to submit through your payment processor. Always respond inside the window - a late rebuttal forfeits the dispute regardless of merit.