How does a BIN work?
Card numbers are structured. The leading digits identify the issuer, and the issuer assigns ranges within them to card products. A BIN table, licensed from schemes, processors or data vendors, maps each range to attributes: issuer name, issuing country, brand, debit, credit or prepaid, and consumer or commercial. Payment systems look the BIN up when a card is entered, before the authorization is sent. Visa’s merchant guidance lists the uses: identifying prepaid cards, identifying issuers, fraud and chargeback analytics, routing and approval-rate optimisation.
Why does the BIN matter for routing and approval rate?
It is the earliest reliable information about the card. As an illustrative example: a merchant learns from BIN data that 30% of its card payments come from one country, where a domestic acquirer approves 80% against 60% cross-border. Routing those 6,000 monthly payments by BIN country adds about 1,200 approvals. The same data lets a checkout block card types that a market forbids or the merchant does not accept, such as prepaid cards for subscriptions.
What goes wrong with BIN data?
Tables go stale as banks merge, reissue ranges and move to eight-digit BINs. Visa warns that as eight-digit BINs spread, merchants can no longer rely on the first six digits for authorization, routing and clearing. Co-badged cards carry more than one brand, so the same BIN may route through different networks. And a BIN says nothing about the cardholder: it describes the card, not the person using it.
Where does Omno use it?
In Omno, card attributes are among the conditions routing and PSP eligibility rules can use, alongside country, method, currency, customer group and customer verification level. Card blocking stops cards that should not be processed, and the routing-decision log records which rule matched.