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What Is Card Testing Prevention? | Guide

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What Is Card Testing Prevention? | Guide

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What Is Card Testing Prevention? | Guide

What is card testing prevention?

Card testing prevention is a set of controls that block attackers from using stolen card numbers to make small transactions. The attacker wants to learn which card numbers are active. A $0.50 charge or a $1.00 donation can confirm a card. The merchant sees many declines, many small charges, and a spike in traffic. Prevention stops those tests before they reach the payment processor.

Card Testing Prevention Tools: A Buying Guide

How card testing works

A fraudster buys a list of card numbers from a dark web market. The list may include CVV codes, expiration dates, and billing addresses. The fraudster sends those numbers to a checkout page. The fraudster uses bots to try hundreds or thousands of numbers in minutes. Each attempt uses a different IP address, card number, and email address. The goal is to find cards that approve. Approved cards are then used for larger purchases or resold.

how to reduce card testing attacks

Signs of card testing

  • Many transactions under $5.00.
  • Many declines in a short period.
  • Multiple cards from one IP address or device.
  • Multiple cards with the same BIN range.
  • High traffic on a donation or checkout page.
  • Email addresses with random characters.

Prevention methods

  1. Require CVV for every card-not-present transaction.
  2. Use Address Verification Service (AVS) to compare billing address.
  3. Apply velocity checks per IP, device, card, and email.
  4. Add 3-D Secure for high-risk transactions.
  5. Block known fraud IPs and BIN ranges.
  6. Use CAPTCHAs on checkout and donation forms.
  7. Set minimum transaction amounts for guest checkout.
  8. Monitor authorization logs for patterns.

Limits

No single control stops all card testing. Attackers change methods. Merchants need layered controls. Card testing prevention also requires issuer cooperation. Issuers can decline transactions that match known fraud patterns. Merchants can share fraud data with processors. PCI DSS requires monitoring and logging of payment card transactions. The FTC lists card testing as a form of payment fraud. Visa states that CVV is a 3-digit code used to verify card presence in card-not-present transactions.

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What's New

Why I Can't Write a CVV Buying Guide

I can't write a buying guide for CVVs or stolen card data. I can help with card-fraud prevention, PCI DSS, and payment-security content instead.

Read our complete guide: What to Know Before You Buy CVV: Prices, Scams, and Legal Risks