What Is a Merchant Acquirer?
A merchant acquirer is the bank or financial institution that processes card payments on behalf of a business. It accepts transactions from your card machine or website, routes them through Visa and Mastercard to the customer's bank, and settles the money into your business account.
The acquirer also underwrites you and carries the risk: if your business generates chargebacks or goes bust owing refunds, the acquirer is on the hook. That is why opening a dedicated merchant account involves an application, and why acquirers price each business individually.
Rates checked: August 2026
Where the acquirer sits in a card payment
Four parties touch every card payment. The customer's bank (the issuer) holds their money. The card scheme, Visa or Mastercard, is the network in the middle. The acquirer is the institution on your side. And you are the merchant. When a customer taps their card, your terminal sends the transaction to your acquirer, which asks the issuer for authorisation through the scheme, gets an answer in a couple of seconds, and later settles the cleared funds into your account.
The acquirer takes its fee out of that flow. Part of it covers the interchange it must pay the issuer and the scheme fees it must pay Visa or Mastercard; the rest is its own margin. This is why acquirer pricing varies so much between businesses: your card mix, transaction size and sector change the underlying costs the acquirer pays before it earns anything.
In the UK, acquiring is a regulated activity. Firms need authorisation to hold and move merchants' money, which is why the acquirer layer exists at all rather than every shop connecting straight to Visa.
Acquirer vs issuer vs gateway vs facilitator
| Party | Whose side | What it does | UK examples |
|---|---|---|---|
| Acquirer | The business's | Processes transactions, underwrites the merchant, settles funds | Worldpay, Barclaycard Payments, Elavon, Lloyds Cardnet, Global Payments |
| Issuer | The customer's | Issued the card, approves or declines each payment, releases the money | Any bank that issues cards: Barclays, Monzo, HSBC |
| Gateway | Technical layer | Carries the transaction data securely from checkout or terminal to the acquirer | Often bundled with the acquirer or provider |
| Payment facilitator | The business's (aggregated) | Holds one master acquiring relationship and processes many small businesses under it | SumUp, Square, Zettle |
Why it matters which route you take
Deal with an acquirer directly and you get a dedicated merchant account, your own merchant ID and individually negotiated rates, typically in exchange for underwriting and a monthly fee. Use a payment facilitator and you skip the application entirely but pay a flat rate: SumUp charges 1.69%, Square and Zettle 1.75%. The structural difference between those two routes is the subject of our answer on payment facilitators vs merchant accounts.
Roughly speaking, flat-rate facilitators win below £4,000 to £5,000 a month in card takings and negotiated acquiring wins above it. If you are not sure whether you even need your own merchant account, start with do I need a merchant account in the UK.
MerchantSwitch is a free comparison service; we are paid by providers when we successfully match a business. We are an introducer, not a lender or acquirer, and we are not regulated by the FCA.
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