Best Payment Gateways for UK Businesses 2026: How to Compare Your Options

Quick summary: what is the best payment gateway in the UK?

There is no single payment gateway that is best for every UK business.

The right choice depends on how you take payments, your transaction volumes, business sector, website or software integration, merchant account, customer locations and the level of control you need over your payment setup.

As a starting point:

• Stripe offers an integrated payments platform with APIs, hosted checkout options, multiple payment methods and straightforward published UK pricing.
• Square combines online and face-to-face payments with simple published pricing, making it relevant to many smaller businesses.
• Mollie offers online payments on a pay-as-you-go basis, with volume and IC++ pricing available for larger businesses.
• Worldpay provides ecommerce acquiring and gateway services for smaller merchants as well as larger and more complex businesses.
• Adyen combines gateway, processing and acquiring capabilities within a broader payments platform and is often relevant to larger or international merchants.
• Elavon / Opayo provides UK ecommerce gateway and merchant-account services, including hosted online payment options.
• Businesses wanting more independence from a single acquirer may need an acquirer-agnostic or multi-acquirer gateway rather than an all-in-one payment provider.

The important question is therefore not:

“Which payment gateway is best?”

It is:

“Which payment gateway is best for the way my business needs to take payments?”

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UK payment gateways compared

The table below is designed as a starting point rather than a ranking from best to worst.

Pricing note: Prices shown are publicly advertised provider prices checked on 12 August 2026. They are not market averages or quotations. Different card types, payment methods, currencies and business profiles can attract different charges.

Sources: Stripe UK pricing, Square UK pricing, Mollie UK pricing, Worldpay eCommerce, Adyen pricing and Elavon online payments.

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What is a payment gateway?

A payment gateway is the technology that securely carries payment information between the customer-facing checkout and the systems involved in authorising the transaction.

For an online card payment, the journey broadly looks like:

Customer → checkout → payment gateway → payment processor/acquirer → card network → card issuer → authorisation response

The gateway is therefore not necessarily the same thing as the merchant account.

This distinction matters because some businesses use:

one provider for everything

while others use:

a separate gateway + separate acquiring bank or merchant account.

Larger or more complex merchants may also use several acquiring connections through a gateway or payment-orchestration layer.

Payment gateway vs payment processor vs merchant account

These terms are often used interchangeably, but they perform different functions.

Payment gateway

The gateway provides the technical connection that allows payment information to move securely through the transaction journey.

Payment processor

The processor handles the technical processing of the transaction between the different parties involved.

Acquirer or merchant account provider

The acquiring relationship enables the merchant to accept card payments and ultimately receive settlement.

Full-stack payment provider

A full-stack provider supplies several or all of these services within the same platform.

Providers such as Stripe, Adyen, Worldpay and Mollie offer integrated payment services rather than requiring every merchant to source a completely separate gateway and acquirer.

For a straightforward business, an all-in-one solution can be convenient.

For a more complex merchant, separating the gateway and acquiring relationships can provide greater flexibility.

For a wider explanation of provider selection, see our guide to comparing UK payment providers.

What are the different types of payment gateway?

Understanding the type of gateway you need is often more useful than starting with a list of provider names.

1. All-in-one payment gateway and processing platform

The provider supplies the gateway alongside the wider payment-processing service.

Examples include:

• Stripe
• Square
• Mollie
• Adyen
• Worldpay
• Elavon.

The main attraction is simplicity.

The merchant does not normally have to construct the payment stack from several unrelated providers.

This can work particularly well for smaller and medium-sized ecommerce businesses.

However, growing businesses should still understand what happens if they later want to:

• change acquirer
• migrate recurring customers
• use multiple merchant accounts
• expand internationally
• introduce more complex transaction routing.

2. Hosted payment gateway

With a hosted checkout, the customer is either redirected to a secure payment page operated by the payment provider or uses provider-hosted payment components within the checkout.

This can reduce the amount of sensitive card information handled directly by the merchant's own systems.

Hosted payment pages can be particularly useful where a business wants:

• faster implementation
• less bespoke development
• provider-managed checkout infrastructure
• a simpler approach to online card acceptance.

The trade-off can be less control over the payment experience than a completely bespoke integration.

3. API or directly integrated gateway

An API-led integration gives the business or its developer greater control over the payment journey.

This can be relevant where payments are embedded deeply into:

• a website
• an app
• booking software
• SaaS software
• an ERP
• a CRM
• industry-specific software.

The more customised the payment journey becomes, the more important it is to consider the gateway as part of the wider technology architecture rather than simply as a tool for taking transactions.

4. Acquirer-agnostic payment gateway

An acquirer-agnostic gateway can connect with more than one acquiring provider rather than tying the merchant to one acquiring relationship.

This can be useful where a merchant wants to:

• change merchant account without rebuilding the whole checkout
• use several acquirers
• operate different acquiring arrangements in different countries
• reduce dependence on one processor
• build payment routing or failover
• negotiate acquiring independently from gateway technology.

NMI, for example, describes its platform as supporting multiple acquirer relationships and an agnostic payment gateway.

View NMI's payment platform information.

For more complex merchants, whether a gateway is tied to a single acquirer can become a very important consideration.

Which payment gateway is best for a small business?

For a smaller business, simplicity can be more important than creating the most technically sophisticated payment stack.

Things to consider include:

• no or low monthly fees
• easy ecommerce integration
• transparent transaction pricing
• payment links
• Apple Pay and Google Pay
• straightforward reporting
• face-to-face payments where required.

For example, Square currently publishes online UK-card pricing of 1.4% + 25p.

Stripe currently charges 1.5% + 20p for standard UK cards on its standard pricing model.

Mollie currently lists UK domestic consumer Visa and Mastercard payments at 1.20% + 20p. Mollie also advertises tailored volume pricing for businesses processing more than £50,000 per month.

These examples do not mean one provider is automatically cheaper or more suitable than another.

The merchant should also consider:

• average transaction value
• international card mix
• refunds
• chargebacks
• required payment methods
• gateway and integration requirements
• other account or product charges.

Which payment gateway is best for a growing business?

As a business grows, the decision often moves away from:

“How quickly can we start taking payments?”

towards:

“How much control do we need over our payment infrastructure?”

Growing merchants may need to consider:

• transaction volume
• effective processing cost
• IC+ or IC++ pricing
• multiple merchant accounts
• API flexibility
• settlement
• reconciliation
• authorisation performance
• fraud tools
• token portability
• international acquiring
• gateway independence.

Stripe offers custom pricing and IC+ options for higher-volume or more complex businesses.

Mollie also advertises volume pricing and IC++ options for larger processing volumes.

At greater scale, businesses may also consider providers such as Adyen and Worldpay, where the payment infrastructure extends considerably beyond a simple hosted ecommerce checkout.

Which payment gateway is best for complex businesses?

This is where a generic “top 10 payment gateways” list becomes much less useful.

A more complex merchant may need to consider:

• several acquirers
• multiple merchant IDs
• high transaction values
• specialist sectors
• international acquiring
• platform payments
• split payments
• payment orchestration
• recurring payments
• tokenisation
• specialist fraud rules
• complex reconciliation
• unusual settlement requirements.

For these businesses, the gateway should be assessed alongside the whole payment architecture.

A technically excellent gateway may still be inappropriate if the acquiring provider does not support the merchant's:

• sector
• Merchant Category Code
• transaction profile
• countries
• fulfilment model.

Merchant Advice Service therefore looks at gateway fit and acquiring fit together when helping businesses compare payment providers.

Compare payment gateway providers through The Payments Directory®.

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Which payment gateway is best for high-risk businesses?

There is no universal “best high-risk payment gateway”.

A gateway may technically be capable of processing a transaction while the acquiring bank behind that transaction is unwilling to support the merchant's business model.

Higher-risk businesses therefore need to establish both:

Can the gateway support what we need technically?

and:

Is there an acquiring provider connected to it that will support our business?

Relevant considerations can include:

• Merchant Category Code
• sector
• chargeback exposure
• future delivery
• customer geography
• transaction values
• processing history
• fulfilment
• regulatory status.

For specialist guidance, see our Payment Gateways for High-Risk Merchants guide.

What should you compare when choosing a payment gateway?

1. Acquirer compatibility

This is one of the most overlooked questions.

Ask:

Is the gateway tied to one acquirer?

or:

Can it connect with several acquiring banks?

If changing acquirer later would require replacing the whole gateway integration, switching provider may become significantly more complicated.

2. Website and software integrations

Check whether the gateway works with your existing technology.

This may include:

• Shopify
• WooCommerce
• Adobe Commerce / Magento
• booking systems
• EPOS
• CRM software
• ERP systems
• accounting software
• custom applications.

A provider may advertise an API without having a ready-made integration for the particular software your business uses.

Those are not the same thing.

3. Hosted checkout vs API

Consider how much control you need over the checkout journey.

A relatively simple merchant may prefer a hosted solution.

A software platform or larger ecommerce company may require a more deeply embedded API integration.

4. Payment methods

Cards are no longer the only consideration.

Depending on the business, the gateway may need to support:

• Visa
• Mastercard
• American Express
• Apple Pay
• Google Pay
• Pay by Bank
• direct debit
• Buy Now, Pay Later
• local payment methods.

Stripe, for example, currently states that its platform supports more than 100 payment methods through one integration.

For more information, see our Alternative Payment Method Gateway guide.

5. Payment gateway fees

Payment-gateway pricing can be structured in several ways.

You may encounter:

• percentage transaction fees
• fixed transaction fees
• gateway fees
• monthly charges
• authorisation fees
• setup costs
• minimum monthly commitments
• refund charges
• chargeback fees
• FX charges
• cross-border fees.

Do not assume that an advertised percentage represents the complete cost of accepting a payment.

The gateway charge and merchant-acquiring charge may be:

combined

or:

shown separately

depending on the provider.

For a wider explanation of card-processing costs, see our Merchant Account Fees Explained guide.

Published UK online payment pricing examples

The following examples illustrate how differently payment gateways and payment platforms can price their services.

Pricing last checked: 12 August 2026. Always check the provider's current pricing and terms before making a decision.

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Why the cheapest payment gateway may not be the best payment gateway

Price matters, but an apparently cheaper gateway can become expensive if it creates problems elsewhere.

A gateway that cannot support your acquirer

You may end up having to change your merchant account as well.

Poor integration

Custom development costs can outweigh a small saving in transaction fees.

Limited payment methods

Customers may be unable to pay using the methods they prefer.

Weak reconciliation

Finance teams may spend considerably more time manually matching transactions, fees and payouts.

Limited token portability

Changing provider later can become more complicated if stored payment credentials cannot easily be migrated.

Inappropriate provider risk appetite

The gateway may work technically while the underlying acquirer will not support the merchant.

The best payment gateway should therefore be judged on total fit, not simply its published transaction rate.

Payment gateway security: what should businesses check?

Security should be considered at both gateway and merchant level.

Relevant areas include:

• PCI DSS
• encryption
• tokenisation
• 3D Secure
• fraud detection
• velocity controls
• device and behavioural analysis
• Strong Customer Authentication
• access controls
• monitoring and reporting.

Using a hosted payment page can reduce the amount of sensitive payment information handled directly within a merchant's own systems, although merchants should still understand their own PCI DSS responsibilities.

Security features should be assessed against the merchant's actual fraud profile rather than simply counting how many fraud tools a provider advertises.

What happens if your payment gateway goes down?

For a business relying heavily on online payments, gateway availability can directly affect revenue.

Ask prospective providers about:

• platform availability
• historic outages
• technical support
• incident communication
• failover
• multiple-acquirer capability
• contingency arrangements.

Businesses where payment availability is particularly critical may need to consider whether using one gateway or one acquiring connection creates a single point of failure.

This can lead into a wider multi-acquirer or payment-orchestration strategy.

Do you need an acquirer-agnostic payment gateway?

Not every business does.

For many SMEs, using one integrated provider is considerably simpler.

An acquirer-agnostic gateway becomes more relevant if you:

• want to negotiate acquiring separately
• process through several acquirers
• operate internationally
• want failover options
• have several merchant IDs
• expect to switch acquirer in future
• need greater control over transaction routing.

The key question is:

How tightly do you want your gateway technology tied to your acquiring provider?

For businesses processing significant volumes, that question should ideally be considered before signing a long-term payment arrangement.

Payment gateway vs payment orchestration

A payment gateway connects the merchant's payment journey into the wider processing ecosystem.

Payment orchestration goes further by potentially managing several payment providers, gateways, acquirers or payment methods through a wider technology layer.

An orchestration platform may support functions including:

• smart routing
• failover
• multiple PSPs
• multiple acquirers
• transaction optimisation
• centralised reporting.

Most smaller businesses do not need full payment orchestration.

However, it can become relevant as payment complexity and transaction volumes increase.

Read our Payment Orchestration guide.

Can I keep my payment gateway if I change merchant account?

Sometimes.

It depends on whether:

• the gateway supports the new acquirer
• your existing gateway contract allows the change
• your integration is portable
• existing payment tokens can be retained or migrated
• recurring payments can be transferred.

This is one of the strongest reasons to understand whether a gateway is acquirer-specific or acquirer-agnostic before signing up.

A provider switch that looks simple commercially can become technically complicated if the gateway and stored customer-payment credentials also need to be replaced.

Which payment gateway should marketplaces and platforms use?

Marketplaces and platforms have additional considerations because the customer payment may need to be allocated between several parties.

Requirements can include:

• seller onboarding
• seller verification
• split payments
• commissions
• payouts
• refunds
• chargebacks
• reconciliation.

Rather than repeating that information here, see our detailed Split Payment Gateways for Marketplaces and Platforms guide.

What should subscription businesses look for?

Subscription businesses need to think beyond the initial transaction.

Important areas include:

• recurring billing
• stored credentials
• tokenisation
• failed-payment recovery
• account updater services
• customer lifecycle management.

See our updated Subscription Payment Processing guide for a more detailed explanation.

How Merchant Advice Service helps businesses compare payment gateways

Merchant Advice Service helps businesses understand their payment requirements before approaching providers.

For payment-gateway enquiries, that can include looking at:

• business sector
• monthly turnover
• transaction values
• merchant-account requirements
• existing acquirer
• website or software
• required integrations
• payment methods
• currencies
• customer locations
• recurring payments
• marketplace or split-payment requirements
• previous declines
• higher-risk requirements.

The objective is not simply to create a list of well-known gateways.

It is to identify which type of gateway and acquiring arrangement is appropriate for the business.

Compare payment gateway providers through The Payments Directory®.

For more information about our process, see How Merchant Advice Service Works.

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Sources and reference links

Provider features and publicly advertised prices in this guide were checked against the providers' own websites on 12 August 2026.

Stripe

Stripe UK pricing

Square

Square UK payment pricing

Mollie

Mollie UK payment pricing

Worldpay

Worldpay eCommerce

Adyen

Adyen UK payment-method pricing

Elavon / Opayo

Elavon UK online payments

NMI

NMI Payments platform

Editorial and commercial disclosure

Merchant Advice Service is an independent payments information, comparison and provider-matching service.

MAS may receive commission or a referral fee from some payment providers where a business chooses to proceed following an introduction. This does not determine the factual information or publicly advertised pricing included in this guide.

Providers have not paid for inclusion in this article unless explicitly stated.

The providers listed are examples of payment gateway and payment-processing options available to UK businesses and do not represent a complete whole-of-market list or a ranking from best to worst.

Provider features, integrations, pricing and acceptance criteria can change. Businesses should check current information directly with the provider before entering into an agreement.

Merchant Advice Service does not make underwriting decisions or guarantee that a provider will accept a particular business.

Provider information last checked: 12 August 2026.