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Merchants integrate tools like Google reCAPTCHA v3 or Cloudflare Turnstile onto checkout pages. These tools analyze user behavior, mouse movements, and browser configurations to differentiate legitimate human shoppers from automated validation scripts. 3. Address Verification Service (AVS)

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Scanning real-time blacklists to see if a card is flagged without attempting a transaction. Merchants integrate tools like Google reCAPTCHA v3 or

Payment gateways may suspend or terminate a merchant's account if their fraud or decline ratio exceeds strict thresholds. and 3D Secure protocols.

– Discussing address verification service (AVS), CVV matching, and 3D Secure protocols.