Card networks are essential to the financial transaction ecosystem, connecting merchants, consumers, and financial institutions. These advanced systems ensure secure and efficient electronic payments worldwide. Card schemes like Visa, Mastercard, American Express, and others, actively track monthly disputes, known as chargebacks, monitoring sales performance and fraud risks. When the number of disputes exceeds acceptable limits, businesses may be enrolled in monitoring programs that can impose monthly penalties and additional fees.
Each network uses specific methods to assess transaction risks and track fraud rates. For monitoring, Visa focuses on descriptors, Mastercard on merchant IDs, or MIDs, and American Express, Discover, Diners, and JCB on account IDs. This approach allows precise tracking of merchant performance and potential risk areas.
Visa Visa operates the Visa Acquirer Monitoring Program (VAMP) to track combined dispute and fraud risk at the descriptor level, including VAMP Ratio and enumeration metrics. Mastercard Mastercard runs the Acquirer Chargeback Monitoring Program with Excessive Chargeback Merchant and High Excessive Chargeback Merchant tiers, tracking chargeback ratios in basis points by merchant account ID. Amex American Express applies Fraud Full Recourse, Immediate Chargeback, and Partial Immediate Chargeback programs when thresholds are exceeded, monitoring merchant performance by account ID.