Merchant

A merchant is a business that accepts a payment instrument, most commonly a debit or credit card, as payment for goods or services it sells to customers. The term applies to retailers large and small, from a corner shop to a multinational online store, as well as to service providers such as restaurants, hotels and professional firms that take card payments from clients.

Within the card payments system, the merchant sits at one end of a chain that includes the customer's card issuer, a card network such as Visa or Mastercard, and an acquiring bank or payment processor that enables the merchant to accept cards in the first place. Each party in that chain earns a fee from every transaction, which is one reason merchants pay charges such as the merchant discount rate on card sales.

A merchant is simply the seller's side of any card transaction, the shop or business accepting the payment rather than making it. When someone taps a card to pay for groceries, the grocery store is the merchant; the person tapping the card is the cardholder. Everything in the payments industry built around accepting cards, from point-of-sale terminals to fraud checks, exists to serve that one basic relationship between a merchant and its customers.

Behind the scenes, becoming able to accept cards is more involved than simply plugging in a terminal. A business must be approved, or onboarded, by an acquiring bank or payment processor, which assesses the business's risk and assigns it a merchant account before any card transactions can be processed.

Card networks classify merchants using a four-digit merchant category code, which describes the type of business, such as a restaurant, a travel agency or a utility company. These codes affect how transactions are processed, what rewards or fees apply, and how card networks and issuers monitor for unusual spending patterns.

Before a business can accept cards, it typically needs a merchant account set up by an acquiring bank, which takes on the risk of processing that business's transactions. Acquirers assess factors such as the merchant's industry, transaction size and chargeback history, and higher-risk merchants, such as those in industries prone to disputes, often face higher fees or additional scrutiny.

Because merchants handle large volumes of card transactions, they are also a focal point for fraud prevention across the payments industry. Acquiring banks and card networks monitor merchant activity for unusual patterns, such as a sudden spike in transaction volume, a high rate of disputed charges, or transactions inconsistent with a merchant's declared business type, any of which can trigger additional scrutiny or, in serious cases, termination of the merchant's ability to accept cards.

Merchants, in turn, are expected to follow security standards such as the Payment Card Industry Data Security Standard when storing and processing cardholder data, reflecting the shared responsibility between merchants, acquirers and card networks for keeping the overall payments ecosystem secure.

Before a new business can start accepting cards, it typically goes through a merchant onboarding process in which the acquiring bank or payment processor reviews the business's registration documents, ownership structure, expected transaction volumes and industry type. Certain categories of business, sometimes described as high-risk merchants, such as those in travel, subscription services or adult entertainment, often face more detailed underwriting and may be charged higher processing fees to reflect the greater likelihood of chargebacks or fraud associated with those sectors.

This underwriting step exists because the acquiring bank effectively vouches for the merchant within the broader card network, taking on financial responsibility if the merchant cannot cover chargebacks or refunds, which is why acquirers are selective about which businesses they agree to process payments for.

Merchants ultimately bear several layers of cost for accepting cards, including interchange fees paid to the cardholder's issuing bank, scheme fees paid to the card network, and a margin for the acquirer or processor, all typically bundled into the single rate a merchant sees on its processing statement.