
A Merchant Data Breach Gives the Acquirer 24 Hours to Tell Mastercard and Three Days to Tell Visa. What Both Networks Require After a Compromise.
When a merchant is breached, the card networks hold its acquirer responsible for reporting, forensics and remediation. The deadlines in Visa's June 2026 What To Do If Compromised guide and Mastercard's account data compromise rules, what each can cost, and what a merchant-services team should have ready.












































