Also called: Mastercard Dispute Resolution Initiative, Mastercom
What Mastercard Dispute Resolution is
Mastercard Dispute Resolution is the process for deciding responsibility when an issuer and an acquirer disagree about a Mastercard transaction. It covers disputes about a transaction’s validity, the goods or services provided, or transaction data. Mastercard’s rules govern the process.
Mastercom is the case-management application issuers and acquirers use to exchange dispute information and supporting documents. It is a tool used during the process, not a separate type of dispute. Your business works through its acquirer rather than filing directly in Mastercom.
A missed deadline can decide who keeps the disputed funds before anyone weighs your evidence.
How the dispute process works
A cardholder contacts their issuer, and the issuer decides whether a reason code supports a chargeback. The chargeback moves the disputed amount from the acquirer to the issuer. The acquirer can accept it or send a second presentment with evidence. The issuer can accept that response or continue the case through pre-arbitration and arbitration, where Mastercard determines financial responsibility.
A separate compliance process addresses a Mastercard rule violation that caused documented financial loss when no chargeback process covers the issue. Either the issuer or acquirer can start a compliance case. The process can include pre-compliance before escalation.
Mastercard Collaboration can alert an acquirer to a pending dispute before a first chargeback is processed. The acquirer can ask you for transaction records or other evidence, giving you a chance to resolve the claim earlier.
Deadlines and the risk of inaction
Response deadlines are part of the process, and missing one can leave you responsible for the disputed funds. The guide dated July 2025 states that supporting documents for certain dual-message cases are generally due in Mastercom within 8 calendar days. It also gives 45 calendar days for a second presentment after chargeback settlement and 10 calendar days for a response to an arbitration case.
Those periods depend on the case stage and applicable rules. Your acquirer should give you the deadline for your specific case. Send clear, relevant records promptly, such as proof of delivery, a signed agreement, or customer communications. Incomplete, illegible, or late evidence can weaken your response.
What it means for your costs
A chargeback can remove the disputed sale amount from your funds, and an adverse decision leaves the loss with your business. The process also requires staff time to locate records, prepare evidence, and meet the deadline. A successful response can return the disputed amount, but it does not guarantee that every case-level fee is reversed.
Mastercard’s rules include case filing and technical violation fees between payment-system customers. They do not establish one universal fee schedule for merchants or a standard line name on your processing statement. Review any dispute-related debit from your acquirer against the case outcome and the fee terms in your merchant agreement.
What you can actually change
- Route requests quickly. Give your acquirer a staff contact who can retrieve receipts, delivery records, and customer messages as soon as a Collaboration request arrives.
- Track every deadline. Record the case stage and response due date from your acquirer. For a second presentment, include evidence that directly addresses the dispute reason.
- Audit dispute debits. Compare each disputed amount and fee with the case outcome and your merchant agreement. Do not assume a Mastercard case fee is a standard merchant charge.
Frequently asked questions
Is Mastercom the same as Mastercard Dispute Resolution?
No. Mastercard Dispute Resolution is the rules and process for resolving disputes. Mastercom is the application issuers and acquirers use to manage cases and exchange supporting documents.
Can a merchant file a Mastercard dispute case directly?
The process is handled between the issuer and acquirer through Mastercard systems. Your business provides records and responses through its acquirer, which handles the case submissions.
What happens if you miss a Mastercard dispute deadline?
A missed response deadline can result in an adverse case outcome or leave you financially responsible. The July 2025 guide, for example, gives 45 calendar days for a second presentment after chargeback settlement, but your case deadline depends on its stage and applicable rules.