Reason Code List / Mastercard / Reason Code 4999
PREVIEW
A high-level overview
You received this chargeback because the issuer determined a local rule has been violated but no other reason code applies.
Issuers and acquirers must both follow the requirements for the applicable domestic chargeback rules. If a case advances to arbitration, it will be handled domestically.
NOTE: This reason code can only be used for centrally acquired domestic transactions or domestic transactions processed through the Mastercard Network. It can’t be used for Mastercard Commercial Payments Account transactions.
Need help managing Mastercard 4999 chargebacks?
Let AltoShield help you create a comprehensive chargeback management strategy that can lower risk, reduce costs, boost approvals, and improve processing sustainability.
PREVIEW
A high-level overview
You received this chargeback because the issuer determined a local rule has been violated but no other reason code applies.
Issuers and acquirers must both follow the requirements for the applicable domestic chargeback rules. If a case advances to arbitration, it will be handled domestically.
NOTE: This reason code can only be used for centrally acquired domestic transactions or domestic transactions processed through the Mastercard Network. It can’t be used for Mastercard Commercial Payments Account transactions.
Need help managing Mastercard 4999 chargebacks?
Let AltoShield help you create a comprehensive chargeback management strategy that can lower risk, reduce costs, boost approvals, and improve processing sustainability.
PUBLISHED ON: October 19, 2026
WRITTEN BY: Jessica Velasco
