In Mastercard, an addendum dispute is the dispute of a separate transaction that occurs after a valid transaction involving the same merchant and the same cardholder and is applicable when the following conditions are met.

• The cardholder engaged in a valid transaction with the merchant.
• A subsequent transaction occurred with that same merchant without the cardholder’s consent.
• The cardholder contacted the merchant, or attempted to contact the merchant, to resolve the
  dispute.

Dependencies

None

Validations

None