MCC (merchant category code)
A four-digit code the schemes use to classify what a merchant sells. It is assigned at underwriting, it influences pricing and which scheme rules apply, and it is one of the things a business profile that does not match the website will get wrong.
Why it matters to a merchant
A code the merchant does not choose and should still check, because it follows them into pricing, into certain scheme rules and into what some issuers will approve. A code that no longer matches what the business actually sells — common after a shop changes its mix — is worth raising with the provider rather than living with. The mismatch is more common than it sounds, because the code is set once during onboarding from how the business described itself then, and businesses change. A cafe that adds retail shelves, a clinic that starts selling products, a shop that moves most of its volume online — each has become something its code may no longer describe. The symptom is rarely obvious: an unexpected decline rate on certain cards, or a cost that does not match what similar businesses report, rather than an error message. It is worth asking your provider what code your account carries and whether it is still the right one; it is a one-line question and most merchants have never asked it.
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