Best Payment Gateways for UK Businesses: 2026 Comparison Guide

Quick Verdict: Our Top Picks at a Glance

Best Overall	Stripe — best balance of features, pricing transparency, and developer flexibility for most UK eCommerce businesses.
Best for SMBs	Square — flat-rate pricing, instant payouts, and integrated hardware with zero monthly fees on the standard plan.
Best for High Risk	Nomupay — bespoke pricing, 133+ currencies, and dedicated support for complex or higher-risk merchant categories.
Best for Shopify	Shopify Payments— eliminates third-party transaction fees for Shopify merchants; rates improve as you upgrade plans.

Why Your Payment Gateway Choice Matters More Than You Think

A payment gateway is the technology that authorises your customers’ card payments, digital wallets, and bank transfers at checkout, routing encrypted payment data between your store, the card networks, and the banks. But it is far more than background plumbing. The gateway you choose directly shapes three things that determine your store’s profitability: how many customers complete their purchase, how much each transaction costs you, and how quickly you receive your funds.

Poorly chosen gateways cause cart abandonment at the most critical moment. Shoppers abandoning at checkout because the payment form feels unfamiliar or untrustworthy is one of the most expensive and invisible losses a UK online store can suffer. Meanwhile, hidden fees — currency conversion charges, chargeback handling costs, early termination penalties — can easily outweigh any apparent savings on headline transaction rates.

This guide compares ten leading UK payment gateways for 2026, with in-depth profiles of three providers — Square, Nomupay, and Shopify Payments — to help you shortlist with confidence.

What is a Payment Gateway? (And Why You Probably Need One)

A payment gateway sits between your checkout page and the financial infrastructure that moves money. When a customer enters card details, the gateway encrypts that data, requests authorisation from the card network, and relays the approval or decline back to your store — typically within a few seconds.

Unlike a merchant account (which holds funds before they reach your bank) or a payment processor (which manages the fund transfer between banks), the gateway handles the authorisation step and the customer-facing checkout experience. Many modern providers — including Square, Stripe, and Shopify Payments — bundle all three functions under a single contract, removing the need to manage separate relationships.

For UK merchants, the regulatory context matters too. Since Brexit, post-Brexit interchange rules mean UK and EU cards are now classified differently by Visa and Mastercard, which can affect your costs depending on your customer mix. Strong Customer Authentication (SCA) under PSD2 also requires 3D Secure for many card transactions, adding a verification step that affects checkout completion rates. Your gateway must handle both.

Disclosure: This article contains referral links to payment providers. Fees are verified against official provider pages as of February 2026, but are subject to change. Always confirm current rates directly with each provider before signing up.

2026 Payment Gateway Comparison Table

The table below provides a side-by-side snapshot of the ten gateways covered in this guide. Use it as a starting filter; then read the in-depth profiles for the providers that match your model.

Provider	Best For	UK Online Fee	Intl. Card Fee	Currencies	Pricing Model	Our Rating	Learn More
Square	SMBs, omnichannel	1.4% + 25p	2.5% + 25p	Single (£)	Blended	★★★★☆	Visit Square
Nomupay	High-risk / global	Custom quote	Custom quote	133+	Interchange++ or Blended	★★★★★	Visit Nomupay
Stripe	Developers, SaaS	1.5% + 20p	3.25% + 20p	135+	Blended (IC++ available)	★★★★★	Visit Stripe
PayPal	Trust & conversion	2.9% + 30p	+1.29%–2.99%	25	Blended	★★★★☆	Visit PayPal
Braintree	Custom checkout	1.9% + 20p	+1% non-UK	130+	Blended	★★★★☆	Visit Braintree
Adyen	Enterprise / high vol.	IC++ + €0.11	Pass-through	30+	Interchange++	★★★★★	Visit Adyen
Shopify Payments	Shopify stores	2.0%–1.5% + 25p*	International rate	Multiple	Interchange++	★★★★☆	Visit Shopify
Amazon Pay	Amazon shoppers	2.7% + 30p	+0.4%–1.5%	Multiple	Blended	★★★☆☆	Visit Amazon Pay
Worldpay	High-volume retail	Bespoke	Bespoke	120+	Blended / Bespoke	★★★★☆	Visit Worldpay
Elavon	Service businesses	Bespoke	Bespoke	Wide range	Blended / Bespoke	★★★★☆	Visit Elavon

* Shopify Payments UK rate depends on your plan: Basic 2.0% + 25p, Grow 1.7% + 25p, and Advanced 1.5% + 25p. Fees sourced from official provider pages, February 2026. Always verify current rates before making a decision.

How UK Payment Gateway Pricing Works: Blended vs Interchange++

Understanding pricing models is the single most important step in controlling your payment costs. There are three main structures used by UK providers in 2026.

Blended (Flat-Rate) Pricing

A single percentage — sometimes plus a fixed pence amount — applies to every transaction regardless of card type. Square and Stripe use this model. The advantage is simplicity and predictability: you know exactly what each sale costs. The disadvantage is that you pay the same rate whether a customer uses a cheap debit card (where interchange is capped at 0.2%) or an expensive corporate credit card. For most SMBs processing under £100,000 per month, the simplicity outweighs the cost.

Interchange++ Pricing

Every transaction is broken into three transparent components: the interchange fee set by the card network (capped at 0.2% for UK debit, 0.3% for consumer credit under post-Brexit rules), the scheme fee charged by Visa or Mastercard, and the gateway’s own markup. Adyen and Nomupay offer this model. Statements are more complex, but high-volume merchants processing large numbers of domestic debit card transactions can save substantially versus blended rates.

Subscription / Plan-Linked Pricing

Shopify Payments ties your transaction rate to your monthly subscription plan. As you upgrade — from Basic to Grow to Advanced — your per-transaction cost falls. This model suits merchants who are already on Shopify and want to remove the additional third-party transaction fee that Shopify charges when you use a competitor gateway.

Key Principle

Blended pricing suits lower-volume merchants who value simplicity. Interchange++ pricing benefits high-volume merchants who can optimise their card mix. Subscription-linked pricing only makes sense if you are committed to the platform offering it.

Gateway-by-Gateway Profiles: Fees, Features, and Honest Trade-offs

What follows are detailed profiles for each gateway in our comparison, including three primary focuses — Square, Nomupay, and Shopify Payments — plus summaries of the other major providers.

Square – Best for UK SMBs Selling Online and In-Person

Square’s flat-rate pricing means Visa, Mastercard, and American Express are all charged at the same rate, removing the guesswork of card-type variability. The model also includes PCI compliance management and chargeback handling at no additional cost — genuine value that is easy to overlook when comparing headline rates.

What Square does well: The integration between online and in-person sales is genuinely seamless. A boutique retailer selling at a market stall and through their website gets unified inventory, unified customer data, and a reconciled dashboard. Square’s Clearpay integration (buy-now-pay-later) is available with fees set under a separate merchant agreement, which can increase average order value meaningfully for fashion and lifestyle retailers. POS hardware starts from £19.

Where Square falls short: The February 2026 introduction of a 1.5% international card surcharge has been controversial among merchants with overseas customer bases, representing a significant cost increase for businesses like UK tour operators whose bookings come predominantly from US or EU visitors. Square also lacks the Interchange++ option available at providers like Adyen and Nomupay, meaning high-volume merchants do not benefit from UK debit card cost savings.

Square Verdict: The strongest all-in-one choice for UK-focused SMBs selling both online and in-person with modest international volume. Consider alternatives if more than 20–30% of your transactions come from non-UK cards.

Nomupay – Best for Complex, High-Risk, or Global Merchants

What Nomupay does well: The breadth of coverage is exceptional. Nomupay supports 133+ currencies, 200+ payment methods, and operates across 40+ markets through a single integration. For a UK merchant expanding into Southeast Asia, EMEA, or the Americas, the ability to access local acquirers through one gateway — rather than managing separate provider relationships in each region — is a substantial operational advantage. Authorisation rates improve when transactions are routed through local acquirers, and cross-border fees are reduced.

Nomupay’s position as an acquirer-agnostic gateway is particularly valuable for merchants in sectors that mainstream providers decline to serve: CBD, gambling, cryptocurrency-adjacent businesses, adult content, and dropshipping. These categories often face account termination or refused applications at Stripe, Square, and PayPal. Nomupay’s onboarding process is tailored to assess risk profile rather than apply blanket category exclusions.

The unified platform provides real-time transaction visibility, over 120 fraud prevention tools, 3D Secure 2, behavioural analytics, and chargeback defence tools — all included rather than charged as add-ons.

Where Nomupay falls short: The lack of publicly listed pricing requires a sales conversation before you can compare costs, which adds friction to the evaluation process. Nomupay is less suited to very small merchants (under approximately £40,000 monthly volume) for whom the complexity of bespoke pricing outweighs its benefits. Onboarding documentation requirements can be more involved than consumer-facing providers, particularly for higher-risk categories.

Nomupay verdict: The strongest choice for medium-to-large merchants operating in multiple markets, serving higher-risk categories, or needing a genuinely customisable payment infrastructure. Not the right starting point for a small domestic-only store.

Shopify Payments – Best for Shopify Merchants Who Want to Eliminate Extra Fees

The practical implication of this structure is significant. A Shopify merchant on the Basic plan who uses PayPal as their payment provider pays both PayPal’s transaction fee and Shopify’s additional 2.0% fee on every transaction. Switching to Shopify Payments removes that 2.0% entirely, which on a £30 average order value saves 60p per sale before even accounting for card rate differences.

What Shopify Payments does well: Integration is as frictionless as a gateway gets — it activates directly from your Shopify admin and connects immediately with your inventory, order management, and payouts. Shop Pay accelerated checkout, which stores customer payment details securely and enables one-tap purchases, consistently lifts conversion rates for returning customers. Shopify Payments supports 3D Secure for SCA compliance and includes AI-powered fraud analysis at no additional charge. For merchants using Shopify Balance or Shopify Capital, Shopify Payments is the gateway through which those financial products function.

Where Shopify Payments falls short: The Brexit reclassification of UK/EU card transactions as ‘international’ by Visa and Mastercard means UK merchants selling to EU customers may face higher processing rates than they would under a provider with direct EU acquiring. Shopify Payments is only available to merchants on Shopify — it cannot be used with WooCommerce, Magento, or other platforms. Merchants with complex international acquiring needs, multiple currencies, or high-risk categories will find the product insufficient.

Shopify Payments Verdict: An obvious choice for any merchant on Shopify. The combination of eliminating third-party transaction fees and the Shop Pay checkout experience makes it the most cost-efficient option for the platform — but it is only relevant if Shopify is your store.

Other Leading Gateways: Brief Profiles

Stripe – Best for Developer-Led Stores and SaaS

Stripe is the default choice for UK businesses that need a gateway with deep API flexibility. UK card rate is 1.5% + 20p; EEA cards 2.5% + 20p; international cards 3.25% + 20p. Open Banking (bank transfer) payments are processed at 0.7%, capped at £2.00 — a material cost saving for high-value orders. Stripe supports 135+ currencies, and its Billing product handles complex subscription logic, including metered billing and multi-jurisdiction tax calculation. Stripe Radar provides machine-learning fraud detection at no additional cost on standard plans. Best suited to fast-growth online brands, SaaS companies, and platforms needing programmatic payment flows.

PayPal and Braintree – Best for Checkout Trust, and Customisation

PayPal‘s primary value for UK merchants is recognition: it remains one of the most trusted checkout names for domestic shoppers, particularly for higher-value or first-time purchases on unfamiliar sites. Standard domestic rate is approximately 2.9% + 30p. Braintree, PayPal’s developer-focused subsidiary, offers a white-label checkout experience at 1.9% + 20p for standard UK cards, with American Express and non-UK cards incurring higher rates. Braintree is best for merchants who want PayPal’s buyer protection and network with full control over the checkout design.

Adyen – Best for Enterprose and High-Volume Merchants

Adyen’s Interchange++ model provides the most transparent fee structure available to large UK merchants: you pay the actual interchange (capped at 0.2% domestic debit, 0.3% consumer credit), the card scheme fee, and Adyen’s processing markup (typically around €0.11 per transaction). This makes Adyen genuinely cost-effective at scale, particularly for merchants processing large volumes of domestic UK debit card payments. Adyen also offers native Open Banking (‘Pay by Bank’) at lower transaction fees than cards, multi-currency settlement, and a global acquiring footprint. The technical integration is enterprise-grade and requires developer resources.

Amazon Pay – Best for Amazon-Loyal Customer Base

Amazon Pay lets customers check out using their stored Amazon credentials, which reduces friction and leverages Amazon’s fraud protection and A-to-Z Guarantee. The base UK rate is approximately 2.7% + 30p, with a cross-border surcharge of 0.4%–1.5% on international transactions — making it expensive relative to Stripe or Braintree. Best suited to UK stores whose customer demographics overlap strongly with Amazon Prime users.

Worldpay – Best for High-Volume Retailers Needing Established Infrastructure

Worldpay is one of the most widely used acquiring platforms in the UK, processing a majority of UK card transactions. It supports next-business-day settlement (subject to agreement), bespoke volume pricing, and both hosted and API-based checkout integration. Worldpay’s contract terms have historically required multi-year commitments with early termination fees — always verify current terms before signing. FraudSight provides advanced fraud analytics for high-risk or high-volume merchants.

Elavon – Best for Service Businesses and Remote Payments

Elavon combines gateway and acquiring in a single contract, supporting a wide range of card networks, including UnionPay and JCB — useful for businesses serving international visitors. Its Pay By Link feature is particularly well-suited to service businesses or tradespeople who need to send secure payment requests by email or SMS without a full eCommerce store. Next-day funding is available subject to agreement. Pricing is bespoke and not published publicly.

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Which Gateway Fits Your Business? A Decision Framework

The right gateway is determined less by features and more by how your business actually operates. Here are four scenarios illustrating how the decision plays out in practice.

Scenario 1: UK-Focused Small Retail or Hospitality (Under £50,000/month)

You sell both online and in a physical location, your customers are predominantly UK-based, and you want a single system with predictable fees and no technical setup overhead. Square is the strongest fit. Flat-rate pricing, no monthly fee on the standard plan, integrated POS hardware, and instant payout options (at a 1.5% fee) cover the core needs. Note the new 1.5% international card surcharge if you have significant tourist or overseas customer volume.

Scenario 2: Shopify Merchant Scaling from £10,000 to £100,000/month

Every pound saved on transaction fees at this growth stage compounds quickly. Activating Shopify Payments eliminates your third-party transaction fee immediately. At £10,000/month on Basic, avoiding the 2.0% Shopify surcharge saves £200/month versus using PayPal or Stripe. As volume grows and you move to the Grow or Advanced plan, your card rate falls further. The decision point for switching to a standalone provider like Stripe or Adyen arises when your EU customer mix grows enough that Shopify’s Brexit-related international rate classification becomes a meaningful cost.

Scenario 3: Subscription or SaaS Business

Recurring billing is the primary requirement. Stripe Billing handles subscription logic, metered usage, and multi-jurisdiction tax compliance at a level of sophistication that generic gateways do not match. Open Banking support can reduce per-transaction cost on higher-value recurring charges. If you have strong international ambitions, Nomupay’s multi-currency settlement and local acquirer network become relevant as you scale beyond the UK and EEA.

Scenario 4: High-Volume or Higher-Risk Merchant (Over £40,000/month)

At significant volume, Interchange++ pricing at Adyen or Nomupay typically outperforms blended pricing. If your category places you outside Stripe’s or PayPal’s acceptable use policy — CBD, adult, cryptocurrency, gambling-adjacent — Nomupay’s specialist onboarding and risk management infrastructure is effectively the only credible route among the providers in this guide. For purely mainstream categories at high volume, Adyen’s enterprise infrastructure and transparent cost structure make it the benchmarked choice.

Common Mistakes That Cost UK Merchants Money

These are the errors we see most often when businesses choose or switch payment gateways. Each one has a real financial consequence.

• Choosing headline rates alone. A 0.2% lower transaction fee is meaningless if the gateway adds a 2% currency conversion fee, charges for refunds, or costs you conversion rate through a poor checkout experience.
• Ignoring the third-party transaction fee on Shopify. Shopify’s additional 0.6%–2.0% fee on third-party gateways is invisible in most gateway fee comparisons but can represent your largest single payment cost.
• Underestimating integration time for API-first gateways. Stripe and Adyen both offer significant flexibility — but that flexibility requires developer resources. Factoring in development cost is essential when comparing them against hosted solutions.
• Not reviewing contract terms for lock-in. Worldpay’s historical multi-year contracts with termination fees are well documented. Always check the current terms before signing any long-term agreement.
• Assuming ‘free’ gateways have no costs. Providers without monthly fees recover margin through transaction fees, currency conversion, chargeback fees, and premium card surcharges. Model your specific transaction mix before comparing.
• Ignoring SCA and 3D Secure readiness. Strong Customer Authentication is a legal requirement for most UK card transactions under PSD2. Gateways that handle 3D Secure authentication natively reduce your compliance burden and protect your approval rate.

Payment Gateway FAQs

Your Next Steps: How to Choose and Test a Gateway

Narrowing the right gateway for your business comes down to four variables: your monthly transaction volume, your customer geography, your eCommerce platform, and your risk category. Use this framework to shortlist:

1. Calculate your real cost per transaction. Take your average monthly volume, average order value, and estimated card mix (UK debit / UK credit / international). Model the actual cost at each provider’s fee structure, including currency conversion, chargeback fees, and any third-party transaction fees on your platform.
2. Confirm platform compatibility. Not every gateway supports every e-commerce platform. Shopify Payments is exclusive to Shopify. Stripe, Square, and Nomupay all offer broad integration coverage, including WooCommerce, Magento, and BigCommerce. Verify integrations before shortlisting.
3. Test the checkout experience. Set up sandbox or test mode accounts with your top two providers and run the checkout flow yourself on both desktop and mobile. Assess authentication steps, error handling, and checkout speed. A gateway that loses 3–5% of your conversions is far more expensive than any fee difference.
4. Review contracts carefully. Check for minimum monthly fees, early termination clauses, rolling auto-renewals, and chargeback fee structures. For providers without public pricing (Nomupay, Adyen, Worldpay, Elavon), obtain written fee schedules before signing.
5. Negotiate at volume. Most major gateways — including Stripe, Square, Adyen, and Nomupay — will negotiate custom rates for merchants processing above a threshold (typically £40,000–£100,000/month). Your existing processing data is your leverage.

The most expensive payment gateway is not the one with the highest published rate — it is the one that loses you conversions at checkout, hides fees in the small print, or becomes a bottleneck as your business grows.