Acquirer
What Is an Acquirer? Definition and How It Works
Definition
An acquirer is the licenced financial institution that processes card payments on behalf of a merchant, holds the merchant account, and assumes financial liability for the transactions it underwrites.
How it works
The acquirer establishes a merchant account, a commercial relationship authorising the merchant to accept card payments. The acquirer underwrites the merchant by assessing chargeback risk, fraud exposure, and business model before approving the account.
During a transaction, the acquirer receives the authorisation request from the gateway or processor and forwards it through the card network to the issuing bank. On approval, the acquirer guarantees the transaction and commits to funding the merchant.
After capture, the acquirer handles clearing and settlement: it submits captured transactions to the card network, receives interchange from the issuing bank net of fees, and funds the merchant account on the agreed settlement schedule (T+1, T+2, etc.).
Acquirers are subject to card scheme membership rules and must maintain certifications with Visa, Mastercard, and other networks. They are ultimately responsible for ensuring their merchants comply with card scheme rules, and face fines if they do not.
Merchants operate under either a direct acquiring relationship (their own merchant account with a licenced acquirer) or an aggregator model (operating as a sub-merchant under a PayFac's or aggregator's master merchant account).
Why it matters
MDR is the acquirer's pricing mechanism: the merchant pays the acquirer an all-in rate that bundles interchange, scheme fees, and the acquirer's margin. At sufficient volume, this margin is negotiable, but only if the merchant understands the components.
Single-acquirer setups are vulnerable to that acquirer's approval rate performance by market and card type. Routing all volume through one acquirer means one point of failure and no benchmark for whether their approval rates are competitive.
Reserve requirements are set by the acquirer based on risk profile. High-risk merchants (travel, digital goods, subscriptions) may face 5-10% rolling reserves held for 90-180 days, tying up working capital without warning if risk classification changes.
Acquirer relationships are sticky: switching requires re-certification, re-integration, and potential stored credential migration. Merchants with multiple acquirer relationships have leverage in negotiations and flexibility if one underperforms.
With PXP
PXP holds direct acquiring licences in key markets, allowing merchants to use PXP acquiring directly or alongside third-party acquirer connections through a single platform. Merchants can start with PXP acquiring and add external acquirers as volume and market footprint grows.
Frequently asked questions
What's the difference between an acquirer and a payment processor?
An acquirer is a licenced bank with scheme membership that holds the merchant account and takes on financial liability for transactions. A payment processor is a technology service that routes transaction data through the network on the acquirer's behalf. Many acquirers operate their own processing infrastructure, but the roles are legally and functionally distinct.
How do merchants get a direct acquiring relationship?
Direct acquiring typically requires minimum transaction volume, business history, and an underwriting review. Below roughly $1-5M in annual card volume, most merchants use aggregators or PayFacs rather than direct acquiring. Above that threshold, a direct relationship is usually commercially viable and provides better pricing transparency.
How does the acquirer affect authorisation rates?
Acquirers maintain their own connections to card networks and issuers. The quality of those connections, BIN routing accuracy, and real-time network performance all affect whether authorisation requests reach the issuer successfully. Merchants with multi-acquirer setups can compare approval rates by card type across acquirers and route to the best performer.
What is an acquirer reserve and when does it apply?
An acquirer reserve is a percentage of transaction volume held back as a financial buffer against future chargebacks and refunds. Reserves are applied to higher-risk merchants in categories such as travel, digital goods, and subscriptions. Typical reserve rates run 5-10% of monthly volume, held for 90-180 days before release.
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