11 Best Payment Processors in the UK (2026)

Whether you run a high-street shop in Manchester, an e-commerce store shipping from Birmingham, or a B2B supplier exporting from Leeds, your payment processor is the engine behind every transaction. For UK businesses, the choice goes beyond simple fee comparison — it touches on FCA regulation, GBP settlement speed, compatibility with British payment rails like BACS and Faster Payments, and compliance with the UK's post-Brexit SCA rules.

This guide compares the top 11 payment processors serving the UK market in 2026, from established bank-backed acquirers to platforms that bridge domestic checkout with global payment infrastructure.

Top Payment Processors in the UK in 2026

1. PhotonPay

Best for: UK businesses that want a single platform covering domestic checkout, multi-currency management, and global payouts — with stablecoin-native infrastructure for faster, lower-cost international settlement.

PhotonPay is an FCA-authorised payment platform that takes a different architectural approach from traditional processors. Its checkout product accepts both fiat (card and local payment methods) and stablecoins from customers, with settlement landing in the currency of your choice. Beyond checkout, the platform includes multi-currency wallets supporting fiat and stablecoin balances, global payouts to suppliers in 200+ countries via stablecoin rails or local-currency off-ramp, virtual and physical corporate cards, and automated FX conversion between fiat and stablecoins at displayed rates without last-look slippage.

The practical effect for a UK business: domestic customers can pay however they prefer, international collections settle faster and cheaper over stablecoin infrastructure, and paying overseas suppliers no longer means losing days to correspondent banking or 2–4% to hidden FX spreads. For import/export businesses, cross-border e-commerce brands, and companies managing a global supply chain from a UK base, this consolidates what would otherwise require a domestic processor plus a separate cross-border payments provider.

FCA-regulated: Yes
GBP settlement: Yes
UK payment rails: Faster Payments, BACS
Also supports: Stablecoin checkout and settlement, multi-currency fiat + stablecoin wallets, global payouts to 200+ countries, virtual/physical corporate cards, automated FX conversion

2. Stripe

Best for: Online-first businesses, SaaS companies, and startups.

Stripe has built a strong UK presence since launching here in 2016. Its developer-friendly APIs, extensive plugin ecosystem, and transparent pay-as-you-go pricing make it the default choice for many online businesses. Stripe's UK entity is FCA-authorised, and it supports GBP settlement, BACS Direct Debit, and UK-specific payment methods. Its flat-rate pricing (1.5% + 20p for UK cards) is simple but can become expensive at higher volumes.

FCA-regulated: Yes (Stripe Payments UK Ltd)
GBP settlement: Yes
UK payment rails: Faster Payments, BACS Direct Debit, SEPA

3. Checkout.com

Best for: Mid-to-large online merchants wanting customisable payment logic.

Headquartered in London, Checkout.com is a homegrown UK success story. It offers a unified API for card acquiring, alternative payment methods, and payouts. Unlike Stripe, Checkout.com typically quotes interchange-plus pricing, which can be more cost-effective for businesses processing over £500K/month. Strong on multi-currency settlement and real-time reporting.

FCA-regulated: Yes
GBP settlement: Yes, plus multi-currency
UK payment rails: Faster Payments, BACS, Direct Debit

4. Barclaycard Payments

Best for: Established UK businesses wanting a bank-backed acquirer.

As the acquiring arm of Barclays, Barclaycard processes roughly one in every three card transactions in the UK. It offers a full suite spanning in-store terminals, online gateways, and phone payments. The major advantage is direct integration with Barclays business banking, which can speed settlement. Pricing requires a custom quote, and the contract terms can be less flexible than fintech alternatives.

FCA-regulated: Yes (part of Barclays Bank UK PLC)
GBP settlement: Native
UK payment rails: BACS, Faster Payments, CHAPS, Direct Debit

5. Adyen

Best for: Large omnichannel retailers and international brands.

Dutch-headquartered Adyen has a substantial UK operation and is the processor behind brands like M&S, Etsy, and Uber. It offers a single platform for online, in-store, and app payments with direct connections to card schemes — no intermediary gateways. Like Worldpay, pricing is custom-quoted, making it less accessible for smaller merchants.

FCA-regulated: Yes (UK branch)
GBP settlement: Yes
UK payment rails: Faster Payments, BACS Direct Debit

6. Opayo (formerly Sage Pay, now part of Elavon)

Best for: Small-to-medium UK businesses wanting an established, no-nonsense provider.

Opayo has been a fixture in the UK payments landscape for over two decades. Now owned by Elavon (a subsidiary of U.S. Bancorp), it provides gateway and merchant account services with a focus on reliability rather than cutting-edge features. Integration with Sage accounting software is a natural plus for businesses already in that ecosystem.

FCA-regulated: Yes (via Elavon)
GBP settlement: Yes
UK payment rails: Faster Payments, Direct Debit

7. PayPal

Best for: Small businesses and sole traders wanting instant setup.

PayPal's brand recognition means UK consumers trust it — 86% of UK online shoppers have a PayPal account. Setup takes minutes and involves no lengthy underwriting, but transaction fees (2.9% + 30p for UK sales) are among the highest on this list. Best used as a secondary option alongside a lower-cost primary processor.

FCA-regulated: Yes (PayPal UK Ltd)
GBP settlement: Yes
UK payment rails: Limited — primarily card and PayPal Wallet

8. Worldpay

Best for: Large enterprises and high-volume retailers.

Worldpay is the UK's largest payment processor by transaction volume. Founded in the UK and now part of FIS, it processes roughly 40% of all card transactions in the country. It supports in-store, online, and phone payments, with direct connections to all major card schemes. Pricing is custom-quoted, which can work well at enterprise scale but offers less transparency for small businesses.

FCA-regulated: Yes
GBP settlement: Native
UK payment rails: BACS, Faster Payments, Direct Debit

9. Revolut Business

Best for: Digitally-native SMEs already using Revolut for banking.

Revolut's business accounts come with built-in payment acceptance, letting you take card payments online via payment links or API. It also supports multi-currency holding, which is useful if you buy from suppliers in EUR or USD. The pricing is competitive (from 1.3% + 20p for UK cards), and GBP settlement to your Revolut business account is instant.

FCA-regulated: Yes (Revolut Ltd)
GBP settlement: Yes (instant to Revolut account)
UK payment rails: Faster Payments, Direct Debit

10. Square

Best for: Small brick-and-mortar shops, pop-ups, and market traders.

Square's card readers and point-of-sale system are ubiquitous at UK farmers' markets, independent cafés, and pop-up shops. Flat-rate pricing (1.75% for in-person, 1.4% + 25p for UK online) is transparent and there are no monthly fees. Less suitable for businesses with complex online needs or high transaction volumes.

FCA-regulated: Yes (Squareup Europe Ltd)
GBP settlement: Yes (next business day)
UK payment rails: Primarily card-based

11. SumUp

Best for: Micro-businesses, sole traders, and occasional sellers.

SumUp is Square's closest UK competitor, offering portable card readers and a simple payment link tool. Its 1.69% in-person rate is slightly cheaper than Square, and there is no monthly contract. The feature set is intentionally minimal — it works well for straightforward card acceptance but lacks the depth larger businesses need.

FCA-regulated: Yes (SumUp Ltd)
GBP settlement: Yes (2–3 business days typical)
UK payment rails: Card-based

Payment Processor vs Payment Gateway: A Quick Distinction

These two terms are often used interchangeably, but they serve different functions:

A payment processor handles the actual transaction — it communicates with card networks (Visa, Mastercard), the customer's issuing bank, and your acquiring bank to authorise and settle payments. Think Worldpay or Barclaycard.
A payment gateway is the front-end layer — it encrypts payment data and passes it securely from your checkout page to the processor. Think Stripe's checkout widget or PayPal's payment page.

Many modern providers bundle both functions into a single service, so the distinction is less rigid than it once was. When evaluating options, clarify whether you are getting a full-stack solution or just one piece of the puzzle.

How to Choose the Suitable Payment Processor

Your Business Profile	Recommended Approach
Primarily UK customers, under £100K/month	Stripe or Revolut Business — transparent pricing, quick setup
UK customers, over £500K/month	Checkout.com or negotiate with Worldpay/Barclaycard for interchange-plus
Physical shop or market stall	Square or SumUp — low hardware cost, no contract
UK domestic + international trade (import/export, global e-commerce)	PhotonPay — checkout + multi-currency wallets + global payouts on one platform, with stablecoin-native settlement for cross-border speed
Enterprise omnichannel	Adyen or Worldpay — custom pricing, full API access
Sage accounting user, mid-volume	Opayo — native Sage integration and established reliability

FAQ

What does a payment processor actually cost in the UK?

It depends on the pricing model. Flat-rate processors like Stripe charge 1.5% + 20p per UK card transaction — simple but can get expensive at volume. Interchange-plus processors like Checkout.com pass through the card network's base rate and add their own margin, which typically works out cheaper above roughly £500K/month in card volume. Bank-backed acquirers like Worldpay and Barclaycard quote custom rates. Always ask whether the quoted fee includes gateway, PCI compliance, and chargeback handling — some providers quote a low processing rate but charge separately for everything else.

Which payment processor is best for a small UK business?

For most UK small businesses starting out, Stripe offers the quickest setup with transparent pricing and no monthly minimums. If you take payments in person (shop, stall, café), Square or SumUp provide low-cost card readers with no contract. If you buy from suppliers abroad as well as selling in the UK, PhotonPay combines checkout with multi-currency management on one platform, so you are not paying separate FX fees to your bank on supplier payments.

Do I need an FCA-authorised payment processor?

Yes. Any payment processor that handles UK customer funds — authorising transactions, holding settlement before transfer, or providing payment accounts — must be authorised by the Financial Conduct Authority. Using an unauthorised provider puts your ability to receive settlement at risk and may breach your merchant agreement. Every processor listed in this guide holds FCA authorisation. You can verify a firm's status on the FCA Register at register.fca.org.uk.

Can one payment processor handle both UK and international transactions?

It depends on the processor. Most domestic-focused options like Square, SumUp, and Opayo are built primarily for UK card payments and offer limited international support. Stripe, Adyen, Checkout.com, and Revolut do cover international payments but route through traditional banking networks — so you will pay FX conversion fees and wait for correspondent bank settlement. PhotonPay is the only provider on this list that uses stablecoin-native infrastructure for cross-border settlement, which sidesteps correspondent banking delays and deductions entirely. If international trade is central to your business, factor cross-border capability into your choice rather than treating it as an afterthought.

Final Thoughts

Choosing a UK payment processor comes down to understanding where your money comes from and where it needs to go. If your customer base is predominantly British, a domestic-focused processor like Stripe, Checkout.com, or Worldpay will cover most of your needs at a competitive cost. But if your business crosses borders — importing goods, selling to overseas customers, paying international suppliers — a processor that only handles domestic card transactions leaves gaps. In that scenario, a platform that combines checkout with global payment infrastructure, like PhotonPay, consolidates your payment stack instead of forcing you to manage separate providers for domestic and cross-border flows. Newer infrastructure choices like stablecoin-native settlement can further reduce the cost and friction of moving money across currencies. The right setup isn't always the biggest name on the list — it's the one that matches how your business actually moves money.