BINs Explained: Why the First Six Digits Matter
The BIN decides how a card is treated at checkout. Here is how to pick the right one for ads, subscriptions and everyday spend.
The first six digits decide a lot
A BIN (bank identification number) is the first six digits of a card number. It tells the payment network who issued the card, what kind of card it is — business, prepaid, signature, world — and which country the issuer sits in. Acquirers and risk engines use it heavily when deciding whether to approve a transaction.
Why ad platforms care
Meta, Google and TikTok score new payment methods aggressively. A BIN that has seen a lot of previous chargebacks in the ad category can be declined before anyone looks at your account. A clean business-tier BIN often goes through where a consumer prepaid BIN fails. That is why we offer nine, and why media buyers test a few before committing a campaign budget.
How to choose one
- For cold ad accounts, start with a business or corporate BIN.
- For subscriptions and trials, a prepaid BIN is usually enough.
- For mobile wallets, pick a BIN whose tier is designed for tokenisation.
- If a merchant declines a card that works elsewhere, try a second BIN before assuming the merchant is the problem.
What a BIN does not do
A BIN cannot fix a mismatched billing address, an over-limit balance or a merchant that blocks prepaid cards outright. Nor does changing BINs make a fraudulent transaction legitimate. Think of it as a fit between your use case and the issuer profile — not as a bypass.