While October’s full of tricks and treats, Visa’s new VAMP rules have merchants and acquirers wondering which one they’re about to get.

Visa’s overhauled Acquirer Monitoring Program (VAMP) just stepped out of the shadows, bringing new ratios, tighter thresholds, and portfolio-level scrutiny that can turn a few bad nights into a long, costly nightmare for merchants and acquirers alike. With businesses and FIs scrambling to comply, Chargebacks911 today unveiled program-ready updates across its dispute-management suite, helping clients obtain and submit the “hard-to-see” proof Visa now expects, mitigate dispute risks, and keep compliance issues and fines from creeping in.

VAMP combines all of Visa’s previous fraud and dispute programs into one global system—one that keeps a much closer eye on how merchants and their acquiring banks handle chargebacks and fraud. Under the new rules, if an acquirer’s overall fraud and dispute levels rise above Visa’s acceptable range, the penalties can be steep, including per-transaction fines and mandatory remediation plans. To stay ahead, many acquirers are now setting their own internal limits that are even stricter than Visa’s, passing those standards down to merchants to make sure everyone in their portfolio remains in compliance.

With the enforcement of the new VAMP guidelines officially beginning Oct. 1, anyone who isn’t prepared could find themselves paying for it.

“VAMP’s goal is to flush fraud out of the network faster,” said Zak Matthews, Vice President of Solutions Engineering and Partnerships at Chargebacks911. “But the real fright for operators is in the fine print: new ratios, regional minimums, and evolving exclusion rules put emphasis on precise, provable evidence and portfolio-wide controls. At Chargebacks911, we’ve rebuilt our playbooks and solutions so clients can meet Visa’s bar without ‘ghosting’ their conversion rates.”

To stay out of Visa’s crosshairs, merchants and acquirers will need to sharpen their defenses across several fronts. The goal isn’t just to stay compliant—it’s to preserve profitability, protect merchant accounts, and keep customer experience intact.

Here’s what every stakeholder should prioritize:

Strengthen evidence readiness: Gather and align the data Visa now expects: device and session information, account and login history, descriptor transparency, usage or delivery confirmation, and subscription renewal or cancellation flows. These data points form the foundation for Compelling Evidence 3.0, Visa’s newest evidence standard for proving transaction legitimacy.

Leverage pre-dispute resolution tools early: Whenever possible, resolve claims through Rapid Dispute Resolution (RDR) or Cardholder Dispute Resolution Network (CDRN) channels. Visa has clarified that disputes closed through these systems—along with qualifying CE3.0 cases—can be excluded from your VAMP ratio when reported correctly and on time.

Monitor and mitigate enumeration attacks: With Visa estimating $1.1 billion in annual enumeration losses, businesses should implement velocity checks, BIN/IP screening, and behavioral analytics tuned to Visa’s Account Attack Intelligence (VAAI) Score parameters. Enumeration incidents now factor directly into VAMP risk calculations.

Track portfolio ratios and high-risk merchants: For acquirers and payfacs, visibility is everything. Use portfolio dashboards that mirror Visa’s new count-based ratio logic and flag merchants nearing 50 bps (Above Standard) or 70 bps (Excessive) thresholds. Monitor dispute drivers, model remediation outcomes, and document corrective actions aligned to Visa’s OneERS case-management cadence.

Balance fraud controls with customer experience: Avoid the temptation to over-decline or over-refund in panic. Instead, calibrate authentication, pre-dispute routing, and refund policies to minimize loss while maintaining smooth transactions, which is Visa’s ultimate intent behind VAMP’s lifecycle-risk model.

“Each of these steps demands extensive data orchestration, compliance tracking, and inter-platform coordination,” added Matthews. “For most merchants and acquirers, trying to manage all of this manually—or across multiple, disconnected platforms—can quickly turn into a costly horror story.”

According to Eaton, this is where Chargebacks911 steps in. The company’s unified dispute-management platform doesn’t just automate evidence collection, pre-dispute routing, merchant account monitoring, and remediation reporting—it connects merchants and acquiring banks on the same real-time data stream. This shared view of transaction activity allows both sides to analyze, respond, and resolve disputes from a single source of data. The result is faster resolutions, lower ratios, fewer manual processes, and the confidence that every party in the payment chain is aligned with Visa’s latest compliance standards.