Guide · Singapore
Acquirer, gateway, PSP: what the words actually mean
An acquirer holds your merchant account and settles your money. A gateway is the technical route a payment takes to reach one. "PSP" is used loosely for either, and sometimes for both. The distinction matters commercially: it decides who holds the licence, who holds the risk, and who you are actually talking to when something goes wrong with a payout.
In short
- Acquirer — licensed, holds your merchant account, settles your money.
- Gateway — the technical route a card-not-present payment takes to an acquirer.
- PSP — a loose term; ask which of the two the company actually is.
- Payment facilitator — takes payments under its own merchant account, with you as a sub-merchant.
- The question to ask any provider: is the licence yours, or are you reselling someone else’s?
The short version
| Role | What it does | Does it hold your money? |
|---|---|---|
| Acquirer | Holds the merchant account, accepts the payment on your behalf, settles to you. | Yes. |
| Gateway | Carries the transaction from a checkout or terminal to an acquirer. | No. |
| Card scheme | Runs the network and the rules (Visa, Mastercard, UnionPay). | No. |
| Issuer | The customer’s bank; approves or declines and bills the customer. | No — it holds theirs. |
| Wallet | The customer-facing app (Alipay, WeChat Pay, Apple Pay). | No. |
| Payment facilitator | Acquires under its own merchant account; you are a sub-merchant. | Yes, before you. |
The acquirer
The acquirer is the licensed institution that holds your merchant account. It accepts the payment on your behalf, takes on the merchant-side risk, and settles the money to your bank account. In Singapore, acquiring is a licensed activity under the Payment Services Act 2019 and appears by name in a licensee’s scope in the MAS register.
Because it holds the money and the licence, the acquirer is the party that decides whether to onboard you, what your rate is, and what happens on a chargeback. It is also the party that has to run KYC and KYB on your business — which is why there is no instant self-serve signup for a real merchant account.
Practical consequence: when a payout is late, the acquirer is the only party that can tell you why. If your provider is not the acquirer, they are relaying the question.
The gateway
A gateway is the technical route a payment takes from a checkout page or a terminal to an acquirer. It handles the API, the hosted payment page, tokenisation and the message format. It does not hold your money and it does not hold a merchant account for you.
The word is mostly used about card-not-present payments — websites, apps, subscriptions — because that is where the routing problem is real. At a physical counter the terminal itself plays the same role.
Many companies are both. An acquirer with its own checkout page and its own SDK is acting as gateway and acquirer at once, which is usually simpler for a merchant: one contract, one support line, one reconciliation.
PSP, ISO, payfac and the rest
"Payment service provider" is a loose commercial term rather than a defined role. It is used for gateways, for acquirers, and for companies that resell someone else’s acquiring under their own brand. If a provider calls itself a PSP, the useful follow-up is: is the licence yours, or whose is it?
An ISO — independent sales organisation — sells and services merchant accounts on an acquirer’s behalf without holding the licence. A payment facilitator goes further: it holds one merchant account of its own and takes payments for many businesses underneath it as sub-merchants. That is why a payfac can onboard you in minutes and an acquirer cannot; the trade-off is that you are inside someone else’s account, with their risk appetite deciding your fate.
None of these arrangements is wrong. They are different trade-offs between speed of onboarding and directness of relationship, and the only mistake is not knowing which one you are in.
Who is who in a Singapore card sale
- The customer taps a card or a phone on your terminal.
- The terminal sends the transaction to your acquirer.
- The acquirer routes it over the card scheme’s network — Visa, Mastercard, UnionPay.
- The scheme routes it to the customer’s issuer, which approves or declines.
- The answer travels back the same way; your terminal prints a receipt.
- Later, the acquirer settles the day’s approved transactions to you, net of fees.
A QR wallet sale follows the same shape with the wallet operator in the issuer’s place. Dynamic PayNow follows it with Singapore’s own real-time transfer rail in the middle. In all three cases the acquirer is the party at your end of the chain.
Why it matters when you are choosing
It changes who you are actually buying from. A reseller’s rate is set by the acquirer behind it, its onboarding decision is made by that acquirer, and its answer to "why is my settlement late" is a forwarded email. None of that is disqualifying — but it should be priced in, and it is rarely on the comparison page.
It also changes what you can verify. You can look an acquirer up in the MAS register in a minute. You cannot look up a reseller’s arrangement with its acquirer at all.
So ask one question early: is the licence yours? A direct answer is a good sign regardless of which way it goes.
Where Uniweb Pay sits
Uniweb Pay is the acquirer. Uniweb Pte Ltd holds the Payment Services Act licence — Major Payment Institution, No. PS20200612 — with merchant acquisition named in scope, and it is listed in the MAS register under that name. The licence is not resold from anyone.
It also plays the gateway role for its own merchants: a hosted checkout page for websites, an SDK for in-app payments, and the terminal in store. One contract covers all three, and they settle into a single SGD payout on a T+1 cycle.
Questions merchants ask
What is a merchant acquirer?
The licensed institution that holds a merchant’s account, accepts card and wallet payments on the merchant’s behalf, carries the merchant-side risk, and settles the money to the merchant’s bank account. In Singapore it is a licensed activity under the Payment Services Act 2019.
Is a payment gateway the same as an acquirer?
No. A gateway is the technical route a payment takes to reach an acquirer; it does not hold a merchant account or settle money. Many companies do both jobs, which is usually simpler for a merchant — one contract, one support line, one reconciliation.
What is a payment facilitator, and how is it different?
A payment facilitator holds one merchant account of its own and takes payments for many businesses underneath it as sub-merchants. That is why it can onboard a merchant in minutes; the trade-off is that the merchant sits inside someone else’s account and inside their risk appetite.
How do I tell which one a provider is?
Ask whether the licence is theirs, then check the answer in the MAS Financial Institutions Directory. A licensee’s entry names the activities it is permitted to carry out, and merchant acquisition appears there by name when it applies.
Talk to us about your counter
Uniweb Pay is a Singapore merchant acquirer, licensed by MAS as a Major Payment Institution (No. PS20200612). Tell us what you sell and who pays you, and we will tell you whether we are the right fit — including when we are not.