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Card BIN

What it is: Card BIN (often called IIN — Issuer Identification Number) is the first digits of a card PAN that identify the network (Visa, Mastercard, etc.), issuing bank, product type (credit/debit/prepaid/commercial), and issuing country. Since the industry’s BIN expansion, merchants may use both 6- and 8-digit BIN logic.

Why it matters for high-risk:
BIN intelligence is essential for approval-rate optimization and fraud/chargeback prevention. High-risk verticals (iGaming/iCasino, betting, adult, forex/CFD, crypto, travel, logistics) rely on BIN data to:

  • Route transactions to the best acquirer/PSP by card country or product type.

  • Apply risk policy (e.g., stricter rules for prepaid/anonymous or particular geos).

  • Comply with network/regional rules and reduce false declines (e.g., local routing to domestic schemes).

  • Tune 3DS strategy and SCA flows per card attributes and region.

  • Detect anomalies (brand mismatch, country mismatch, unsupported product).

Best practices in Card BIN

  • Maintain up-to-date 6- and 8-digit BIN tables; verify BIN providers support the 8-digit standard.

  • Combine BIN checks with device/risk signals (velocity, IP/geo, MCC logic) — don’t over-rely on BIN alone.

  • Use BIN only for legitimate orchestration and risk-scoring; never store more PAN data than PCI DSS allows.

  • Localize routing for LATAM, APAC, MENA, and EU to raise auth rates and cut cross-border declines.

  • Create allow/deny lists for products (e.g., block prepaid for subscriptions; allow debit for cash-out).

Related internal topics (link ideas):
3DS (3DSecure), Acquirer, Fraud Prevention (High-Risk), High-Risk Merchant Account, KYC/KYB, Chargeback Prevention, APAC Payment Processing, APMs.

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