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Chargebacks911

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Chargebacks911 helps merchants prevent, fight, and recover from chargebacks and friendly fraud. On DEV, we share engineering-minded deep dives on disputes, payments risk, fraud signals, and the systems behind them.

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Building Your Own Chargeback and Fraud Ratio Monitor Before the Networks Do
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Building Your Own Chargeback and Fraud Ratio Monitor Before the Networks Do

#analytics #fintech #security
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6 min read
From One Chargeback to a Fraud Ring: Building Link Analysis That Works
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From One Chargeback to a Fraud Ring: Building Link Analysis That Works

#backend #data #security
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6 min read
Finding Fraud Rings with Link Analysis: A Union-Find Approach
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Finding Fraud Rings with Link Analysis: A Union-Find Approach

#algorithms #data #security
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7 min read
Modeling PayPal's Tiered Dispute Fee With a Trailing-Window Monitor
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Modeling PayPal's Tiered Dispute Fee With a Trailing-Window Monitor

#architecture #backend #fintech #systemdesign
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6 min read
Don't Refund on 'Delivered': Hardening Return Workflows Against FTID Fraud
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Don't Refund on 'Delivered': Hardening Return Workflows Against FTID Fraud

#backend #programming #security
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6 min read
Detecting Mastercard 2-Series Cards: BIN Range Logic That Doesn't Break
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Detecting Mastercard 2-Series Cards: BIN Range Logic That Doesn't Break

#programming #softwaredevelopment #softwareengineering
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6 min read
Detecting Abnormal Keyed-Entry Rates from POS Entry Mode Data
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Detecting Abnormal Keyed-Entry Rates from POS Entry Mode Data

#analytics #data #monitoring #security
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6 min read
Building a VAMP Ratio Monitor: Merchant and Portfolio Math in Practice
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Building a VAMP Ratio Monitor: Merchant and Portfolio Math in Practice

#analytics #fintech #security
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6 min read
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