Payment aggregator vs payment gateway vs PSP: what is the difference?

Short answer: in the payment aggregator vs payment gateway vs PSP debate, the three terms describe different jobs. A payment gateway is the technology that securely passes payment data from your checkout to the processor. A payment aggregator (or payment facilitator) signs up many merchants as sub-merchants under its own master account and collects and settles funds for them, which makes onboarding fast. A PSP (payment service provider) is the broad commercial term for any company that lets merchants accept payments, and it may bundle a gateway, aggregation, acquiring and local methods. The acquirer is the regulated bank or institution that contracts with the card schemes and settles card payments.

Knowing which is which helps you compare offers like for like, understand who holds your money and who is responsible when something goes wrong.

The roles in one payment

When a customer pays by card online, several parties are involved:

1. 1.Checkout and gateway: the customer enters details; the gateway encrypts them and routes the request.
2. 2.Processor: formats the authorisation message and sends it through the card network.
3. 3.Card network: Visa, Mastercard or a domestic scheme routes the request to the issuer.
4. 4.Issuer: the customer's bank approves or declines.
5. 5.Acquirer: the merchant's bank or institution receives the approval, later settles the funds and carries the scheme obligations.
6. 6.Settlement to the merchant: either directly from the acquirer to the merchant's own account, or via an aggregator that settles to many sub-merchants.

Many companies combine several roles, which is why marketing labels overlap. The question to ask is always: who does the technology, who holds the funds, and who carries the risk?

Payment gateway

A payment gateway is the technical layer between your checkout and the processing network. It typically provides hosted payment pages, card fields, an API, tokenisation, fraud screening hooks and routing.

• Holds funds? Usually not; funds flow from the acquirer to the merchant or aggregator.
• Contract: you often need a separate merchant account with an acquirer, or a PSP that provides one.
• Best for: merchants with their own acquiring relationship who want control over routing and providers.

Browse card acquiring and gateways for examples.

Payment aggregator (payment facilitator)

An aggregator holds a master merchant account with an acquirer and onboards merchants underneath it as sub-merchants. Card schemes call this model a payment facilitator (PayFac).

• Holds funds? Yes. Funds for all sub-merchants are collected under the aggregator's account and then paid out to each merchant.
• Onboarding: quick, often online, because the aggregator does the underwriting under the acquirer's rules.
• Risk: the aggregator is liable to the acquirer for its sub-merchants' chargebacks and fraud, so it may hold reserves or delay payouts.
• Regulation: in many countries an aggregator needs a licence or must operate under a licensed partner. In India, for example, the RBI authorises payment aggregators and requires a minimum net worth of ₹15 crore at application, rising to ₹25 crore by the end of the third financial year, while pure payment gateways are treated as technology providers.
• Best for: small and medium businesses, marketplaces and platforms that need to start quickly.

See aggregators and cascading and the Razorpay profile as an example of an Indian aggregator.

PSP (payment service provider)

"PSP" is an umbrella term. In everyday use it means any company that lets a merchant accept payments, from a full-stack provider like Stripe or Adyen to a regional specialist in local methods. In EU law "payment service provider" has a narrower legal meaning: banks, payment institutions and e-money institutions authorised to provide payment services.

A PSP may act as:

• a gateway on top of your own acquirer;
• an aggregator that holds funds for you;
• an acquirer itself, if it holds the necessary licences and scheme memberships;
• or a combination, depending on country and method.

Acquirer and merchant account

The acquirer (acquiring bank) is the regulated institution that holds the relationship with card schemes and settles card transactions. With a dedicated merchant account you contract with the acquirer directly or through a PSP, receive funds in your own name and negotiate terms based on your own risk profile. See acquiring banks.

How the money flows: a simple example

Imagine an online shop that sells a 100-unit order paid by card.

• With an aggregator: the payment is authorised under the aggregator's master merchant account. The acquirer settles the funds to the aggregator, which deducts its fee and pays the remaining amount to the shop on its payout schedule, possibly keeping part of it as a reserve. On the customer's statement the descriptor may show the aggregator's name together with the shop's.
• With a gateway and your own merchant account: the gateway routes the payment to your acquirer. The acquirer settles to your bank account in your name, after deducting its fees. The gateway charges its own technology fee separately.
• With a full-stack PSP: the PSP may do both, acting as gateway and as acquirer or aggregator, and settles to you net of a single blended or interchange-plus fee.

The difference matters most when something goes wrong. If the shop receives a wave of chargebacks, an aggregator can pause payouts to protect itself; with your own merchant account the acquirer applies its own risk rules directly to you, based on your history rather than on a pooled portfolio.

Beyond cards

The same roles exist for other methods. For bank transfers, wallets and QR payments, the "acquirer" role may be played by a local bank, a licensed payment institution or the wallet operator itself, and an aggregator may collect funds in many countries and settle them to you in one currency. When you compare providers for local payment methods, ask the same questions about who holds the funds and who carries the risk.

Side-by-side comparison

• Who holds the funds: gateway — no; aggregator — yes; PSP — depends on the model; acquirer — yes, until settlement.
• Onboarding speed: gateway plus own acquirer — slow; aggregator — fast; PSP — fast to medium.
• Pricing: aggregator — usually blended flat rates; own merchant account — often interchange-plus with more negotiation room.
• Control and data: gateway with own acquirer — highest; aggregator — lowest.
• Risk of sudden holds: higher with aggregators, because they manage risk across many small merchants.

Which model fits your business?

• Early-stage or small business: an aggregator or full-stack PSP gets you live fastest.
• Growing merchant with stable volumes: a dedicated merchant account through a PSP or acquirer can lower costs and reduce hold risk.
• Multi-country or high-volume merchant: a gateway or orchestration layer in front of several acquirers and local-method providers gives control and resilience.
• High-risk vertical: look for providers that explicitly accept your category; see high-risk merchants.

Questions to ask any provider

1. 1.Are you a gateway, an aggregator, an acquirer, or a combination for my country and methods?
2. 2.In whose name are my funds held, and are they safeguarded?
3. 3.What reserve, payout delay or volume caps apply?
4. 4.What pricing model applies, and what is my effective cost on my real transaction mix? (See effective payment cost.)
5. 5.How do I migrate away if needed, including card tokens? (See planned PSP migration.)

For a structured approach to selection, read choosing a PSP: due diligence.

FAQ

Is a payment gateway the same as a PSP?

No. A gateway is a technical component. A PSP is a commercial provider that may include a gateway along with acquiring, aggregation and payment methods.

What is the difference between a payment aggregator and a payment facilitator?

They describe the same model: one master merchant account with many sub-merchants. "Payment facilitator" is the card-scheme term; "payment aggregator" is common in regulation, for example in India.

What is the difference between a PSP and an acquirer?

The acquirer is the regulated institution that settles card payments and holds scheme membership. A PSP sells payment acceptance to merchants and may work with one or several acquirers or be one itself.

Should I choose an aggregator or my own merchant account?

Aggregators are faster to start with; your own merchant account usually offers better pricing, more control and fewer sudden holds once you have volume and history.

Where can I compare providers?

Use the Nominal hub PSP catalog to filter providers by model, method and region. Nominal hub is a directory, not an intermediary.