Since high-risk merchants cannot use chargebacks to address Visa’s risk monitoring, various events under the Visa Acquirer Monitoring Program will impact the merchant’s account with the processing company.
The compliance requirements of the Visa Acquirer Monitoring Program are something that all merchants must take seriously. High-risk merchants must have solid reporting and fraud-prevention software in place, as well as a reliable billing company that understands the implications of the Visa program for their approved amount.
Why High-Risk Merchants Need VAMP Monitoring
High-risk merchants require VAMP-aware payment processing due to the inherent high level of card-not-present transactions within their business models. Categories such as ecommerce, subscriptions, CBD, vape, nutraceuticals, adult, travel, digital products, and dating are inherently higher risk than retail merchants that primarily take card-present transactions.
The Visa Acquirer Monitoring Program (VAMP) calculates the ratio of fraud and dispute transactions to total settled Visa transactions for merchants. Should that ratio be high in any given month, the merchant may be required to remedy the issues, or they will incur fees and see a reduction in their payment-processing reserves.
VAMP Compliance Starts Before Processor Warnings
The best time to fix Visa VAMP issues is before the processor sends a warning. At this point, the acquirer might already have seen the problem affecting the processor’s view of risk.
A compliance program means proactively establishing a system for preventing these issues early in the process. This includes ratio monitoring, dispute tracking, fraud rule adjustments, maintaining support documentation, managing refunds, using proper billing descriptors, and protecting payment pages from enumeration attacks.
Who Should Monitor VAMP Compliance
Merchants that rely on card-not-present Visa transactions and cannot afford any disruptions to payments should find this guide useful.
Specifically, merchants in the following categories may find this information to be of benefit:
- ecommerce companies with high risk
- subscription, continuity and membership companies
- CBD, vape, nutraceutical, adult, travel and dating companies
- digital product and online education companies
- companies recently declined from or warned of their payment processor
- companies with high chargebacks and returned payments
- merchants using NMI, Authorize.Net or some other custom payment gateways
- merchants looking to protect a high risk merchant account
- anyone responsible for reporting Visa VAMP
For merchants whose business would be negatively impacted by a processor review, reserve increase or hold on their account, ensuring compliance with the Visa Acquirer Monitoring Program (VAMP) program should be included in their monthly merchant account checklist.
VAMP Compliance Areas Explained
Visa Acquirer Monitoring Program (VAMP) compliance works best when the merchant separates the major risk areas and assigns clear ownership.
| Compliance Area | What To Monitor | Who Usually Owns It | Why It Matters |
|---|---|---|---|
| Fraud Reports | TC40 records, suspicious orders, fraud alerts and fraud-rule performance | Fraud, risk or payment operations | Fraud reports count toward the VAMP ratio |
| Disputes | TC15 records, chargeback reasons, product patterns and cancellation complaints | Chargeback team, support or finance | Disputes also count toward the VAMP ratio |
| Enumeration | Failed authorization spikes, bot traffic, BIN patterns and VAAI-related signals | Fraud, security or gateway team | Card testing can create monitoring pressure even without many completed sales |
| Billing Clarity | Descriptors, subscription terms, renewal reminders and refund policy | Support, marketing and compliance | Confusion often becomes a dispute |
| Gateway Controls | AVS, CVV, velocity rules, 3DS, tokenization and blocklists | Payments or technical team | Controls reduce fraud without blocking too many good orders |
| Processor Communication | Risk reviews, remediation plans, reserve discussions and documentation | Owner, finance or payments lead | The processor needs proof that the merchant is managing risk |
The goal is not for one team to manage VAMP alone. The goal is to connect fraud, support, billing, fulfillment and payments so the merchant can find the source of risk quickly.
Best Tools and Providers for VAMP Compliance
The right VAMP compliance support depends on whether the merchant needs processor strategy, alert tools, fraud prevention, gateway reporting or chargeback operations.
| Provider Or Tool | Best Fit For | Key Strength | Main Tradeoff |
| Payment Nerds | High-risk merchants that need Visa Acquirer Monitoring Program (VAMP) guidance, high risk merchant account strategy and account-stability support | Connects VAMP compliance to merchant accounts, gateways, fraud controls, chargebacks, reserves and underwriting fit | More consultative than a standalone chargeback tool |
| Verifi | Merchants that need Visa-focused pre-dispute resolution | RDR and CDRN can help resolve disputes before they become chargebacks | Rules must be configured carefully to avoid unnecessary refunds |
| Ethoca | Merchants that want issuer-to-merchant fraud and dispute alerts | Alerts can help stop fulfillment, issue refunds or investigate quickly | Coverage varies by issuer, geography and setup |
| Chargeback Gurus | Merchants needing chargeback strategy, representment and Visa Acquirer Monitoring Program (VAMP) education | Strong fit for chargeback prevention and dispute operations | Does not replace the merchant account or processor relationship |
| Midigator | Merchants that need dispute analytics and response workflows | Useful reporting and representment tools | Works best when payment data is clean and consistent |
| Signifyd | Ecommerce merchants focused on fraud screening and chargeback protection | Fraud decisioning and chargeback protection options | Fit depends on product category, traffic source and risk profile |
| Gateway Fraud Tools | Merchants using NMI, Authorize.Net or similar gateways | AVS, CVV, velocity rules, 3DS and bot controls | Requires ongoing tuning to avoid false declines |
Payment Nerds is usually the strongest fit when the merchant needs help connecting VAMP compliance to processor fit, merchant-account health and chargeback prevention. Software tools can help reduce risk, but they work best when they are part of a broader payment strategy.
How VAMP Impacts High-Risk Merchant Accounts
Visa’s VAMP is the combined name for its fraud and dispute monitoring programs. The VAMP ratio is the number of fraud and non-fraud disputes divided by the number of settled Visa transactions.
For high-risk merchants, VAMP is essential for assessing the exposure of the merchant’s processor and acquirer to fraud on the merchant’s account. Should there be too much fraud on a high-risk merchant’s account, the processor will intervene before the merchant does.
Furthermore, VAMP includes enumeration monitoring. Enumeration attacks happen when bots flood a high-risk website with card information to identify which have valid Visa numbers and expiry dates. The enumeration ratio is the number of suspected enumeration attacks divided by the total number of authorization attempts on the high-risk website. VAAI stands for Visa Account Attack Intelligence and indicates the number of enumeration attacks on a merchant’s account. Any score above the Standard and Excessive thresholds can result in fees for the merchant.
For a high-risk merchant, VAMP goes beyond the public Visa limit. It is a signal to the merchant’s processor of the merchant’s efforts and plans to control fraud activity on their account.
How to Build a VAMP Compliance Plan in 2026
Start with the data. Review the fraud reports from TC40, TC15, settled Visa transactions, refunds, pre-dispute alerts, fraud rules, gateway errors, failed authorizations, and enumeration attempts.
Then assign fixes according to the cause of the fraud. Gateway and bot activity issues will require adjustments to the gateway settings. Subscription-related issues may require changing how the company sends renewal and cancellation notices. Product dissatisfaction may require changes to the product website content or content about refunds. Issues related to descriptor confusion may require adjusting the descriptor in the payment processor settings.
Understanding VAMP Compliance Costs
VAMP compliance costs include things like chargeback alerts, fraud tools, 3DS, gateway upgrades, bot protection, representment software, refund costs, staff time, processor reviews, and outside chargeback support. High-risk merchants will also have to contend with reserves, higher fees, and processing limits due to their higher risk of fraud.
The cost of poor VAMP compliance is usually much higher. If merchants ignore fraud reports and the opportunities to identify the causes of that fraud, they could end up with their funds frozen, their processing access revoked, and even having to seek an emergency provider to fulfill their processing needs. Furthermore, they will have to deal with the difficulties of obtaining a high-risk merchant account later.
Common VAMP Compliance Mistakes
The biggest mistake people make is treating VAMP compliance as something that applies to the response to chargebacks. VAMP compliance includes fraud reports and disputes, so the merchant should focus on preventing issues before a chargeback occurs.
Another mistake is assuming that one tool will solve the problem. There are a variety of tools on the market, such as Verifi, Ethoca, 3DS, fraud filters, and representment software, that can aid the merchant in the compliance process. However, none of them will fix issues with subscription terms, subscription fulfillment, product descriptors, or support from the company offering the subscription products.
Key Features of VAMP Compliance
Weekly VAMP Ratio Tracking
High-risk merchants should not rely on the monthly statement to estimate their VAMP ratio. Instead, merchants should track fraud reports, disputes and settled transactions with their payment provider each week. Tracking these metrics on a weekly basis can help merchants understand where the fraud and dispute problems originate within their business. Are the issues related to one product? One marketing campaign? One third-party affiliate? One type of billing descriptor? One subscription plan? By understanding the source of the problems, merchants can address only those specific issues, rather than negatively impacting other high-volume sales within the business.
TC40 and TC15 Visibility
To calculate the VAMP ratio, merchants must have access to both TC40 and TC15 reports. TC40 represents fraud reports; TC15 represents disputes or chargebacks reported by customers. While many merchants have easy access to their TC15 reports, access to TC40 reports can be difficult. Merchants can ask their payment processor or chargeback resolution provider how to access these reports and how often they are updated.
Fraud Controls with False-Decline Discipline
Having fraud controls in place is essential to reducing the number of fraudulent transactions merchants must deal with. However, merchants must ensure that their fraud controls do not deny legitimate customers access to their products or services. High-risk merchants can use AVS, CVV, velocity checks, device signals, IP checks, risk scoring software and 3DS to create a fraud control system that minimizes fraudulent transactions while minimizing false declines. The best fraud control system for one merchant may not work for another. For example, a merchant that sells digital products may have a different fraud control system than a CBD subscription company or a travel business.
Clear Billing, Refund and Cancellation Workflow
Disputes can result from noncriminal reasons. Customers may have forgotten about their subscription, did not understand their billing descriptor, did not understand when their subscription would renew or wanted a refund. To be VAMP compliant, merchants must have a clear billing and refund policy that minimizes the chance of customer frustration that would result in chargebacks.
Enumeration Attack Prevention
Enumeration attacks occur when bots try to use various credit cards to access a merchant’s checkout page. The enumeration attack ratio is the number of enumerated authorizations divided by the total number of authorizations. VAAI, or Visa Account Attack Intelligence, is the ratio that Visa uses to identify enumeration attacks. Monitoring for enumeration attacks can include monitoring failed authorizations, failed payments, specific BIN numbers, IPs, bots and gateways. Preventing enumeration attacks is part of VAMP compliance.
Pre-Dispute and Alert Workflows
There are many pre-dispute alert tools available to merchants, such as Verifi, Rapid Dispute Resolution, CDRN, Ethoca alerts and more. These alert systems allow merchants to quickly refund customers or investigate issues before they result in chargebacks. However, if a specific product, marketing campaign or subscription continues to result in alerts, the merchant must fix that specific issue.
FAQs About Visa VAMP Compliance
Q: What is VAMP compliance?
A: VAMP compliance entails the management of fraud reports, disputes, and enumeration activity for merchants under the Visa Acquirer Monitoring Program (VAMP). Specifically, VAMP compliance ensures that merchants effectively monitor their VAMP ratio, reduce chargebacks, avoid card testing, and operate in ways that maintain confidence in their payment processor.
Q: What is Visa VAMP?
A: Visa VAMP stands for the Visa Acquirer Monitoring Program or VAMP. This program was established by Visa to monitor fraud, disputes, and enumeration activity in the industry.
Q: Why does the Visa Acquirer Monitoring Program (VAMP) matter for high-risk merchants?
A: The Visa Acquirer Monitoring Program (VAMP) matters for high-risk merchants due to the inherently higher fraud, chargeback, and enumeration activity that is common among those high-risk merchants. If a high-risk merchant reaches a certain VAMP ratio, they may be subjected to various fees, remediation requirements, and a general instability in their merchant account.
Q: How is the VAMP ratio calculated?
A: The VAMP ratio is calculated by adding the number of TC40 fraud reports to the number of TC15 chargebacks for a given merchant, and dividing that number by the total number of settled Visa transactions. This calculation can be performed for each merchant monthly, with the ratio examined more closely if there are increases in either fraud or chargebacks.
Q: What is an enumeration attack?
A: An enumeration attack occurs when bots attempt to test the various payment cards of a merchant by attempting to input them into the merchant’s checkout process or payment page. While these bots may not result in any approved transactions from the merchant, they can still generate activity that contributes to the merchant’s VAMP ratio.
Q: Can chargeback alerts assist with VAMP compliance?
A: Chargeback alerts allow merchants to act before a chargeback occurs, which can help to meet VAMP compliance requirements. However, the most effective method of handling chargebacks is to incorporate tools to address the root of the issue with the merchant (such as billing issues, customer service, fraud, or return policies).
Q: Can Payment Nerds assist with VAMP compliance?
A: Payment Nerds can assist high-risk merchants by reviewing their VAMP exposure, fraud and chargeback activity, improving their payment gateway controls, and comparing payment processor options to find the best fit for protecting their high-risk merchant account stability.
Conclusion
VAMP compliance is now part of how high-risk merchants protect payment access. Merchants need to monitor TC40 fraud reports, TC15 disputes, enumeration activity, billing clarity, gateway controls, and customer service patterns before these issues become processor problems.
Payment Nerds can help high-risk merchants manage Visa Acquirer Monitoring Program (VAMP) compliance, review chargeback trends, improve fraud controls, and protect the stability of their high-risk merchant accounts. The goal is to keep processing predictable, defensible, and ready for growth.
Sources
- Visa. “Visa Acquirer Monitoring Program Fact Sheet.” Accessed June 2026.
- Visa. “Resolve Disputes with Chargeback Management Service.” Accessed June 2026.
- Visa. “Visa Account Attack Intelligence (VAAI) Score.” Accessed June 2026.
- Visa. “Visa Announces Generative AI-Powered Fraud Solution to Combat Account Attacks.” Accessed June 2026.
- Verifi. “Resolve Disputes with CDRN and RDR.” Accessed June 2026.
- Ethoca. “Secure Ecommerce Fraud & Chargeback Protection.” Accessed June 2026.
- Chargeback Gurus. “Visa Acquirer Monitoring Program (VAMP).” Accessed June 2026.
- PCI Security Standards Council. “Merchant Resources.” Accessed June 2026.
