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Chargebacks911

Challenge the Status Quo

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.

chargebacks911.com Clearwater, Florida Joined on Oct 13, 2026 [email protected]

Oct 23

Modeling PayPal's Tiered Dispute Fee With a Trailing-Window Monitor

#architecture #backend #fintech #systemdesign

6 min read

Oct 23

Don't Refund on 'Delivered': Hardening Return Workflows Against FTID Fraud

#backend #programming #security

6 min read

Oct 23

Detecting Mastercard 2-Series Cards: BIN Range Logic That Doesn't Break

#programming #softwaredevelopment #softwareengineering

6 min read

Oct 14

Detecting Abnormal Keyed-Entry Rates from POS Entry Mode Data

#analytics #data #monitoring #security

6 min read

Oct 13

Building a VAMP Ratio Monitor: Merchant and Portfolio Math in Practice

#analytics #fintech #security

6 min read

Oct 13

Designing Account Holds for Chargebacks

#cybersecurity #stripe #fintech #banking

4 min read

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