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Understand Visa's 2026 VAMP 0.9% dispute ratio threshold, how TC40 and TC15 reports count, and when 3-D Secure 2.0 can reduce fraud and disputes. Independent technical note mirroring the canonical version: https://l0t.me/blog/visa-vamp-dispute-thresholds-when-3-d-secure-20-pays-off.php
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Nathan Lawson (2026) studied this question.
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