The merchant's bank in a card payment. It signs up the business, routes each sale for approval, settles the money into the merchant's account - and owns the risk when things go wrong.
Where it sits in one card swipe
Cardholder, merchant, network, issuer - the acquirer is the only one working for the merchant.
Gateway, processor, PSP - how the terms actually map
Encrypts the transaction at checkout and routes it to a processor or acquirer. A gateway doesn't hold merchant funds or take on settlement risk - it's connectivity, not banking.
Runs the authorization and settlement logic on the acquiring bank's behalf. Often the same company as the acquirer, or a close technology partner operating under its license.
Wraps gateway, processing, and often the acquiring relationship itself into one product, so a merchant can start accepting cards without negotiating its own bank relationship. Some PSPs hold their own acquiring license and run full-stack; others partner with a bank acquirer behind the scenes.
The merchant sees one bill - but underneath it, gateway, processor, acquirer, and network are frequently four separate companies, or one company wearing four hats.
Encryption: the card number is never in the open
Card data is locked at the terminal (P2PE) and swapped for a token. The real number is only unlocked inside the acquirer's secure vault - a hardware security module no person can read from.
Cross-border: where you acquire changes the outcome
A local acquirer processes the sale inside the customer's market instead of routing it abroad. The transaction looks domestic to the issuer - so it clears more cleanly.
Financial impact: who gets paid out of one sale
Of five parties in a card sale, the acquirer is the only one whose job is to get the merchant paid.
Where the function is headed
The line between "PSP" and "acquirer" is dissolving - the companies that control the full stack are the ones setting the economics.
If you're navigating where your business fits in the payments chain, I'd welcome the conversation.
Get in touchEducational use only; not affiliated with any card network or acquirer. Fee proportions are illustrative and vary by card type, region, and pricing model. June 2026