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How I Stopped a Credit Card Thief From Ripping Off 3,537 People – and Saved Our Nonprofit in the Process

freecodecamp.orgsite

Describe a fraud technique known as "card testing", in which massive batch of stolen cards are checked for their validity against your API.

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2026-10-10
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Billing › Fraud > Cards: “Describe a fraud technique known as "card testing", in which massive batch of stolen cards are checked for their validity against your API.”