A BIN, Bank Identification Number, is the first six to eight digits of a payment card number.
Definition
A BIN, Bank Identification Number, is the first six to eight digits of a payment card number. It is issued by the card scheme to the bank or financial institution that produced the card, and it encodes the issuing bank, the scheme (Visa, Mastercard, and so on), the country of issue and the card product type — debit, credit, prepaid, commercial, and sometimes the specific programme.
Every card transaction carries its BIN, so payment systems can look up who to route an authorisation request to and what rules apply before the rest of the card number is even considered. The term BIN is used interchangeably with IIN (Issuer Identification Number), which is the newer official name for the same field.
For an iGaming operator, BIN data is one of the richest signals available at the moment of payment. It reveals which issuing banks decline gambling merchant category codes outright, which countries have structurally low approval rates, where 3-D Secure step-up authentication adds the most friction, and whether a card is a type — such as certain prepaid or virtual products — associated with higher fraud or bonus-abuse risk.
In context
Acquirers and PSPs use BIN routing to send each transaction to the processor most likely to approve it: cards on a set of Brazilian BINs go to a local acquirer, European BINs to a European one, so that domestic processing rules and lower cross-border decline rates apply. Operators build BIN-level analytics dashboards that break approval rate, chargeback rate and average deposit by issuing bank and country, then adjust routing, retry logic and which payment methods are surfaced to which players.
BIN also underpins several fraud checks. A BIN whose issuing country differs from the player's verified country of residence is a classic mismatch signal; a cluster of deposits across many different cardholder names but the same handful of BINs can indicate a card-testing or stolen-card operation; and prepaid BINs are often subject to lower limits or extra verification because they are harder to trace.
None of these signals is conclusive alone, so they feed a risk score rather than an automatic block.
Worked example
A PSP notices that card approval for a Brazilian casino is stuck at 62% because deposits are being routed to a European acquirer as cross-border. It switches all transactions on Brazilian BINs to a local acquirer; domestic processing rules apply, and approval rate climbs to 84% within a week with no change to the checkout.
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