In this essay
Merchant acquiring is the service that lets a business accept card payments and receive the money. The acquirer signs the merchant, sends its transactions into card networks such as Visa and Mastercard, settles the funds to the merchant's bank account, and stays answerable to those networks if the merchant generates excessive chargebacks or fails. It earns the difference between what it charges the merchant and the interchange and scheme fees it pays out.
The acquirer is often called the merchant's bank or the acquiring bank. Visa uses that language in Europe: when the cardholder's bank sends a payment to the retailer's bank, which Visa calls the acquiring bank, a small interchange fee is retained, and Visa says it receives none of it. Visa UK: fees and interchange
How does the four-party model work?
Visa and Mastercard run what is usually called a four-party model. The four parties are the cardholder, the issuer that gave the cardholder the card, the merchant, and the acquirer that serves the merchant. The card network sits in the middle: it sets the rules, routes messages between acquirers and issuers, and moves money between them at settlement.
Every card payment then happens in two phases. Authorization happens in real time, while the customer waits. Clearing and settlement happen later, usually in batches, when the merchant's captured transactions are submitted and the money actually moves.
A card or wallet is presented at a terminal or an online checkout.
The acquirer, or a processor working for it, builds the authorization request.
The network routes the request to the bank that issued the card.
The merchant receives a decline code and asks for another method.
An approval code returns to the merchant along the same path.
The issuer pays the acquirer net of interchange; the acquirer pays the merchant net of its fees.
Simplified: gateways, processors and payment facilitators often sit between the merchant and the acquirer, and settlement timing varies by acquirer and market.
Acquirer vs processor vs payment facilitator vs ISO: who does what?
These roles are often bundled into one brand. The test is who holds the scheme relationship, who signs the merchant and who receives settlement funds.
| Role | What it does | Signs the merchant? | Answers to the card networks? |
|---|---|---|---|
| Issuer | Issues the card, approves or declines, bills the cardholder | No | Yes, for its cardholders |
| Acquirer | Holds scheme membership, underwrites the merchant, settles funds | Yes, directly or through a facilitator | Yes, for its merchants and agents |
| Processor | Runs authorization, clearing files and reporting for an acquirer | Sometimes, as the acquirer's agent | Depends on its registration and contracts |
| Payment facilitator | Signs sponsored merchants and receives settlement for them | Yes, for its sponsored merchants | The acquirer remains responsible |
| ISO | Sells and refers merchants for an acquirer | No, the acquirer signs | The acquirer registers it |
| Card network | Sets rules, routes messages, settles issuers and acquirers | No | Sets and enforces the rules |
Visa describes a payment facilitator as a third-party agent that can sign a merchant acceptance agreement on behalf of an acquirer and receive settlement, and its rules keep the acquirer liable for the facilitator and the merchants it sponsors. Visa: the payment facilitator model Mastercard defines a payment facilitator as a service provider registered by an acquirer to facilitate transactions on behalf of submerchants. Mastercard: payment facilitators For ISOs, Visa's Third Party Agent program requires the acquirer, not the agent, to register entities that solicit merchants on its behalf. Visa: Third Party Agent registration FAQ
For the merchant-facing layer around these roles, see payment aggregator vs gateway vs processor.
What does an acquirer underwrite and carry?
Signing a merchant is a form of credit. Two risks matter most.
Chargeback liability. When a cardholder disputes a payment, the issuer can charge it back to the acquirer. The acquirer then debits the merchant. If the merchant cannot pay, for example because it has stopped trading, the acquirer absorbs the loss. Merchants that take payment long before delivery, such as travel or event businesses, create larger exposure because more disputes can arrive after the money has been paid out.
Merchant failure and fraud. A merchant can go insolvent, change its business model after approval, or be set up to commit fraud from the start. The acquirer is the party the networks hold to account.
That is why underwriting looks at the business model, delivery timelines, expected volumes, refund and chargeback history, and ownership. Mastercard describes MATCH Pro as mandatory for its acquirers: they use it to check whether another acquirer previously terminated a merchant, and why, before signing that merchant. Mastercard Developers: MATCH Pro After approval, acquirers manage exposure with reserves, delayed payouts and volume limits; why processors hold funds explains how those controls look from the merchant's side.
The networks also monitor acquirers directly. Visa's Acquirer Monitoring Program is built to help acquirers improve risk controls and reduce fraud and enumeration attacks Visa: introducing the Visa Acquirer Monitoring Program, and Mastercard's Excessive Chargeback Program alerts the acquirer when one of its merchants crosses a chargeback threshold. Mastercard: rules for merchants
How do acquirers make money?
The merchant pays one price, usually called the merchant discount rate or merchant service charge. Inside it are three layers:
- Interchange, paid by the acquirer to the issuer on each transaction.
- Scheme fees, paid by issuers and acquirers to the card network.
- The acquirer's margin, which covers its processing, risk, support and profit.
Visa explains that interchange reimbursement fees are transfer fees between acquiring and issuing banks, and that merchants negotiate and pay a merchant discount to their own financial institution, which can include a range of processing services. Visa: rules and interchange The acquirer's revenue is therefore the merchant discount minus interchange and scheme fees. Pricing models change how visible that split is: a blended rate hides it, while interchange-plus passes interchange and scheme fees through and shows the margin separately. Interchange-plus vs flat-rate pricing works through how to read a statement.
How does settlement to the merchant work?
After authorization, the merchant captures the transaction and the acquirer submits it for clearing. The network calculates what each issuer owes each acquirer, and the money moves between them. The acquirer then pays the merchant on its own schedule.
What reaches the merchant's bank account is rarely the sum of the day's sales. It can be reduced by fees (if the acquirer settles net), refunds, chargebacks, reserve holdbacks and adjustments, and delayed by weekends, bank holidays and cut-off times. A merchant should be able to tie every bank credit back to a batch and a list of transactions, and should agree the settlement schedule in writing before going live.
How does acquiring differ in the US, UK and EU, UAE and Saudi Arabia?
The model is the same everywhere; fee schedules and licensing differ.
- United States. Visa publishes its US interchange reimbursement fee schedules, with separate categories by card type and merchant segment. Visa USA interchange reimbursement fees
- UK and EU. Visa publishes its European interchange separately on its fees and interchange page, and EU rules cap interchange on consumer cards. European Commission: interchange fee fact sheet
- UAE. Acquiring is a licensed activity under the Central Bank of the UAE. Adyen, for example, announced in June 2026 that it had obtained a Retail Payment Services Category II license from the CBUAE. Adyen: UAE Central Bank licenses Adyen See what Adyen's license changes for local settlement.
- Saudi Arabia. The Law of Payments and Payment Services prohibits providing payment services in the Kingdom without a SAMA license. SAMA Rulebook: Law of Payments and Payment Services Domestic debit runs largely on mada; see how mada works.
FAQ
What is the difference between an acquirer and an issuer?
The issuer serves the cardholder: it issues the card and approves or declines payments. The acquirer serves the merchant: it accepts the merchant's transactions and pays the merchant.
Is a payment processor the same as an acquirer?
Not necessarily. A processor handles the technical work of moving transactions, while the acquirer holds the scheme relationship, underwrites the merchant and carries the liability. One company can do both.
Who pays when a merchant cannot cover its chargebacks?
The acquirer. The networks hold the acquirer responsible for its merchants, which is why acquirers hold reserves and monitor chargeback levels.
Is a payment facilitator an acquirer?
No. A payment facilitator signs and pays sponsored merchants under an acquirer's sponsorship. Visa's rules keep the acquirer liable for the facilitator and its sponsored merchants.
What is the merchant discount rate?
It is the total price a merchant pays its acquirer per card transaction. It includes interchange, scheme fees and the acquirer's margin, whether or not the statement shows them separately.
Closing thought and further reading
An acquirer lets a merchant accept cards, pays that merchant, and answers to the card networks when the merchant's chargebacks or failure cost money.
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