How acquirers use fraud intelligence for a competitive edge

Acquirers are offering fraud detection and dispute services as commercial products after merchants began evaluating false positive rates and chargeback handling alongside fees. Visa reduced the Acquirer Monitoring Program (VAMP) trigger ratio from 220 to 150 in April 2026, increasing scrutiny of portfolio-level fraud and dispute activity.

About 65% of merchants estimated their e-commerce false positive rate at between 2% and 10% in 2026. Industry forecasts put global merchant losses from false positives at more than $231 billion in 2026, compared with a forecast $39.6 billion in card fraud losses. Acquirers can bear financial liability when merchants cannot absorb those losses.

The VAMP ratio measures combined fraud and dispute counts divided by total settled Visa transactions. Lowering the threshold to 150 means more acquiring portfolios can trigger monitoring, remediation plans or penalties from schemes.

Acquirers are deploying artificial intelligence to screen transactions in real time across channels and payment types. Digital identity tools and network intelligence are being used to build broader customer profiles. Explainable AI techniques are being implemented so scoring and decline decisions can be audited and shared with merchants.

Commercial approaches now include packaging verified fraud-performance metrics and value-added services in proposals. Some banks and processors offer tiered protection that charges for enhanced analytics, real-time scoring and dispute management support. Others highlight faster dispute handling and improved dispute-win rates when contract discussions focus on revenue retention and operational costs.

Requests for proposals commonly ask for historical false positive rates, dispute ratios and details of chargeback workflows in addition to price. Industry events this year emphasized combining analytics, identity verification and signal-sharing to meet the lower VAMP threshold and to provide evidence of performance for merchant procurement.

A payments executive at a major acquirer described the VAMP revision as ‘a tighter standard that demands new reporting and faster dispute workflows.’

False positives occur when legitimate transactions are declined, costing merchants lost sales and customer churn. Chargebacks add direct losses and administrative expense. The April 2026 VAMP update reduced the trigger ratio to 150, increasing pressure on acquirers to manage fraud and dispute levels across their portfolios.