A payment gateway is the most consequential supplier relationship a UK online shop signs. It sits between your customer’s card and your business account, and the choice affects every transaction you will ever take: fees, conversion rate, refund speed, dispute resolution, Strong Customer Authentication (SCA) handling, and the messy reality of what happens when a card is declined. This guide is written for UK merchants running WooCommerce on SmartXHosting in 2026 — from £50-a-month boutiques to £1m-a-year businesses. It covers the six gateways that matter, the four buy-now-pay-later providers shoppers now expect, the wallet layer (Apple Pay, Google Pay) that halves mobile friction, and the hosting-level plumbing that determines whether your gateway actually works.
How UK payment gateways actually work • Strong Customer Authentication and UK PSD2 • Stripe UK — the default choice • PayPal — the trust layer • GoCardless — Direct Debit for subscriptions • Worldpay, Square, SumUp and other gateways • Buy Now, Pay Later: Klarna, Clearpay, PayPal Pay in 3 • Apple Pay, Google Pay and mobile wallets • Full comparison table • How hosting affects payment processing • Building a three-gateway stack for UK retail • Migration, testing and going live • Frequently asked questions
Before choosing a gateway, it helps to understand what happens when a UK shopper clicks “Place Order” with a card. The payment data does not go directly from browser to your business account — it travels through four distinct entities in under two seconds:
If approved, the gateway captures the funds (immediately or on a subsequent invoice step, depending on your WooCommerce configuration). Settlement — the transfer of actual money from the gateway to your bank — happens later, typically on a two or three day cycle for UK cards. WooCommerce then fires a webhook to your store, and the order moves from Pending to Processing.
Every layer of this chain can fail. Cards decline for dozens of reasons. Gateways reject 3-D Secure challenges. Webhooks drop on flaky servers. Settlement delays add working-capital pressure. Choosing the right gateway means choosing a partner whose failure modes match your risk tolerance — not just their headline fee.
SCA is the most important piece of regulation affecting UK ecommerce in 2026. Derived from the EU PSD2 directive and retained in UK law after Brexit, it requires two-factor authentication on most online card payments. A shopper who enters a card number alone is no longer enough — the issuer needs a second factor before releasing funds.
The three SCA factors, of which any two are needed:
In practice, UK shoppers see a 3-D Secure 2 challenge: a push notification to their banking app, or an SMS code typed into a gateway-hosted interstitial. All major UK gateways handle this automatically provided your WooCommerce Stripe/PayPal extension is current. Your hosting must support TLS 1.2 or higher (SmartXHosting ships TLS 1.3 on all plans) or the secure handshake fails and the payment is declined.
Exemptions that matter to UK merchants:
SCA exemptions reduce customer friction but require the gateway to take on the fraud liability. Stripe and PayPal apply exemptions dynamically; less sophisticated gateways force SCA every time, which hurts conversion.
Stripe is the default recommendation for almost every new UK WooCommerce store. Reasons:
Onboarding takes about 15 minutes for a UK limited company (Companies House number, director ID, business bank account). Sole traders and partnerships sign up similarly. Stripe is regulated in the UK by the Financial Conduct Authority, so the compliance relationship is clean.
Payouts land in your UK bank account two to three working days after capture. Reconciliation is straightforward through Stripe’s dashboard and via the Stripe Xero or QuickBooks integration for automated bookkeeping.
PayPal is the most recognised consumer payment brand in the UK. For a slice of shoppers — typically more cautious or older buyers, plus people who actively use their PayPal balance — PayPal is preferred over any card option. UK research consistently shows a 10–20% lift in checkout conversion for stores that offer PayPal alongside cards.
Standard UK fees are 2.9% + 30p per transaction, higher than Stripe. The upside is zero barrier to signing up: any UK business with a bank account can take PayPal in hours, and the PayPal Buyer Protection scheme reduces dispute anxiety from the shopper’s side.
PayPal Express Checkout shows the PayPal button on product pages and cart alongside the final checkout. For shoppers already signed into PayPal, this is a two-click purchase — no card-number entry, no billing-address typing. Conversion on Express Checkout is typically 20–30% higher than on card-entry checkout for the same cart value.
PayPal Pay in 3 is bundled with PayPal Checkout at no extra merchant cost and offers an interest-free three-instalment split. For higher-average-order-value shops (above £100), this quietly boosts AOV without adding a third-party integration.
GoCardless sits in a different category to Stripe or PayPal. Rather than processing card payments, it handles bank-to-bank transfers via UK Direct Debit (BACS) and similar EU schemes. The fee structure is dramatically different: 1% per transaction, capped at £2.
This makes it the cheapest recurring-payment option on the market for UK merchants selling subscriptions, memberships, B2B invoicing or high-value one-offs. A £500 invoice collected via GoCardless costs £2 — 0.4% — versus £7.70 on Stripe or £14.80 on PayPal.
Best use cases for GoCardless on WooCommerce:
Limitation: GoCardless cannot process one-off card transactions. It complements Stripe or PayPal rather than replacing them. A typical UK subscription business runs Stripe for sign-up (card) and GoCardless for renewals (Direct Debit), switching the payment method after the first successful card charge.
Three further gateways worth knowing about in the UK market:
Worldpay is the UK’s largest payment processor by volume. Pricing is not publicly advertised; merchants negotiate based on projected volume, product category and chargeback history. Typical tier-one rates for high-volume UK merchants sit below 1% + 10p for standard UK cards. Worldpay Access integrates with WooCommerce via official and third-party plugins. Best suited for stores processing over £100,000 monthly where negotiated rates justify the contractual complexity.
Square is the omnichannel choice — one account covers online WooCommerce and physical point-of-sale terminals. UK fees are 1.4% + 25p online and 1.75% in-person. Inventory and customer data sync automatically between channels. Particularly strong for UK retailers with pop-up events, markets or a brick-and-mortar presence alongside the online shop. Apple Pay and Google Pay are included on both online and terminal sides.
SumUp targets micro-merchants: market traders, craft-fair sellers, small independents. Single flat rate of 1.69% per transaction and no monthly fee. WooCommerce integration via the SumUp plugin. Reporting and reconciliation are simpler than Stripe’s but also less flexible. Best for stores under £5,000 monthly turnover where low fixed cost beats feature depth.
Enterprise-grade alternatives with custom pricing. Checkout.com is UK-headquartered and popular with high-volume subscription platforms. Adyen is the Dutch-based processor used by many multinational retailers. Braintree is PayPal’s white-label card gateway, offering a Stripe-like API with PayPal reach. All three are worth evaluating when monthly card volume exceeds £250,000.
Buy Now, Pay Later is now a checkout-default expectation in UK retail, particularly fashion, electronics, homewares and higher-price consumer products. Offering at least one BNPL option typically increases conversion on qualifying cart values by 15–30% and raises average order value similarly.
Klarna is the market leader in UK BNPL. Three consumer-facing options:
Merchant fees sit at around 2.49% + 20p per transaction. Klarna handles all credit-risk assessment and collections — you receive the full order value upfront as if it were any other card payment.
Clearpay splits purchases into four interest-free payments over six weeks. Popular with younger UK shoppers (18–35) and strong in fashion, beauty and home. Merchant fees are 4–6% + 30p, meaningfully higher than Klarna, but the demographic reach and brand recognition justify the cost for suitable product categories.
Bundled free with PayPal Checkout. Three-instalment split for qualifying carts. Lower friction than Klarna/Clearpay because it uses existing PayPal account credentials. Merchant fees are the standard PayPal rate (no extra BNPL fee) — the most cost-efficient BNPL option if you already run PayPal.
For UK stores deciding between BNPL providers, the pragmatic approach is: add PayPal Pay in 3 first (free if PayPal is already enabled), then add Klarna on top if average order value is £75+, and add Clearpay only if your demographic skews young and your margins absorb the higher fee.
Mobile wallets have changed UK checkout behaviour dramatically. Current industry research puts 20–40% of UK mobile ecommerce transactions through Apple Pay or Google Pay — a share that continues to grow each year.
Technically, Apple Pay and Google Pay are not payment gateways themselves. They are payment methods that ride on top of your existing gateway. Stripe, Square and Worldpay all support both wallets natively — a single toggle in gateway settings enables them.
Apple Pay domain verification is a one-off step: Stripe (or your gateway) provides a verification file that must be uploaded to yourdomain.co.uk/.well-known/apple-developer-merchantid-domain-association. Once verified, Apple Pay buttons appear on iOS/Safari sessions automatically.
Google Pay does not need separate domain verification; buttons appear on Chrome/Android automatically when the gateway supports it.
The checkout UX improvement is substantial: a returning iPhone shopper completes a purchase in two taps (Apple Pay button + Face ID). Card-entry checkout takes 30–60 seconds of typing. The conversion lift from wallet enablement is measurable within the first week.
| Gateway | Per-transaction fee | Monthly fee | Recurring | Wallets | Best for |
|---|---|---|---|---|---|
| Stripe UK | 1.5% + 20p UK cards | None | Yes (Billing) | Apple Pay, Google Pay | Default choice for new UK stores |
| PayPal | 2.9% + 30p standard | None | Yes | PayPal wallet, Pay in 3 | Brand trust, international |
| GoCardless | 1% (max £2) | None | Yes (core) | No (Direct Debit) | Subscriptions, B2B invoicing |
| Square | 1.4% + 25p online; 1.75% in-person | None | Yes | Apple Pay, Google Pay | Omnichannel (online + POS) |
| Worldpay | Custom | Custom | Yes | Apple Pay, Google Pay | Enterprise, >£100k/mo |
| SumUp | 1.69% | None | Limited | Limited | Micro-businesses under £5k/mo |
| Klarna | ~2.49% + 20p | None | BNPL | Klarna app | Fashion, electronics, AOV >£50 |
| Clearpay | ~4–6% + 30p | None | BNPL | Clearpay app | Younger demographic retail |
| PayPal Pay in 3 | Free (part of PayPal) | None | BNPL | PayPal | BNPL add-on when PayPal is enabled |
Choosing a gateway is only part of the equation — the hosting beneath your WooCommerce store determines whether the gateway actually works reliably. Three practical concerns:
Every payment gateway requires HTTPS over TLS 1.2 or higher. SCA specifically requires TLS 1.2+ for the 3-D Secure 2 handshake to complete. Outdated TLS 1.0 and TLS 1.1 on your host will silently fail SCA challenges, leading to declined transactions customers blame on you. SmartXHosting provides free Let’s Encrypt SSL with TLS 1.3 on every plan — auto-renewing, covering the apex and www subdomain, supported back to iOS 11 and Android 7.
Every second of delay on the checkout page loses customers. UK research consistently shows conversion drops 7–10% for every 100ms of additional latency after the first 2 seconds. A slow checkout also increases 3-D Secure abandonment — customers time out of the bank app or SMS code window. NVMe SSD storage, Redis Object Cache and WooCommerce-aware caching plugins (that exclude cart/checkout/my-account from static cache) are essential. SmartXHosting ships all three on every WooCommerce Shop plan.
Gateways push payment-status updates via webhooks. If your server is slow, unstable or silently dropping POST requests, webhook failures lead to orders stuck in Pending status when payment actually succeeded, refunds not recorded, or subscription renewals not reflected in customer accounts. Reliable hosting with 99.9%+ uptime, low-latency PHP-FPM and no upstream timeouts prevents these issues.
WooCommerce hosting tuned for UK payments
Every SmartXHosting WooCommerce plan includes free SSL with TLS 1.3, NVMe SSD, Redis Object Cache and Imunify360 WAF — the infrastructure your gateways need to convert reliably. UK-based support for Stripe/PayPal webhook issues.
View ecommerce hosting plansA practical UK retail setup combines three gateways, each playing to its strength:
This covers:
Avoid enabling every gateway you can find. Each extra option adds a second of load time, a few milliseconds of JavaScript overhead, and a degree of decision paralysis for the customer. Three is the sweet spot.
When switching gateways or launching a new store, the rollout checklist is non-negotiable:
4242 4242 4242 4242 for a test card that behaves like a real card, 4000 0025 0000 3155 for an SCA-forced card.Q: Which payment gateway is cheapest for a UK WooCommerce store?
A: GoCardless at 1% capped at £2 is cheapest per transaction, but only works for Direct Debit — ideal for subscriptions not one-offs. For one-off card payments, Stripe UK (1.5% + 20p) and Square (1.4% + 25p) are tied for cheapest. For UK merchants under £250,000 annual revenue, Stripe is almost always the best starting choice.
Q: Can I run Stripe and PayPal on the same WooCommerce store?
A: Yes, and it’s the standard UK setup. Enable both in WooCommerce › Settings › Payments. Set Stripe sort order to 10 and PayPal to 20 so Stripe shows first. Customers pick their preferred option. There is no extra cost to offering both, and the combined coverage of trust-sensitive and price-sensitive shoppers lifts conversion significantly.
Q: Does SCA apply to guest checkout?
A: Yes — SCA applies to the transaction, not to whether the customer has an account. Guest checkouts over £25 still trigger 3-D Secure challenges unless a low-risk exemption applies. The gateway’s fraud engine decides exemption eligibility per transaction.
Q: What happens to recurring subscription payments under SCA?
A: The first subscription payment requires SCA (customer-initiated). Subsequent recurring charges are merchant-initiated transactions and exempt, provided the initial transaction was properly authenticated. Stripe and GoCardless both handle this transition automatically. If a customer updates their card details mid-subscription, the new card triggers a fresh SCA on the next charge.
Q: How quickly do UK gateways pay out?
A: Stripe: two to three working days, configurable. PayPal: funds are in your PayPal account immediately, and you initiate a bank withdrawal (usually next-day). GoCardless: five working days for the Direct Debit to clear, then same-day payout. Worldpay and Square: two to three working days. Expect working capital to be tied up for roughly a week on average — factor that into cashflow planning.
Q: What about refunds?
A: All major UK gateways support refunds initiated from WooCommerce’s order admin. Card refunds via Stripe, PayPal and Square typically reach the customer’s card within five working days. GoCardless refunds take the same five working days as the original Direct Debit clearing. Klarna and Clearpay refunds close the instalment plan and refund any payments already taken. UK law (Consumer Contracts Regulations 2013) requires refunds within 14 days of the customer’s return notification — establish a same-day refund habit as soon as a return is approved.
Q: How do I handle chargebacks?
A: When a customer disputes a charge with their bank, the gateway automatically reverses the funds and charges a chargeback fee (usually £15–£20). You have a window to submit evidence — proof of delivery, customer communication, order details. Stripe’s dispute workflow is the most streamlined; PayPal’s Buyer Protection overlaps with chargeback-like rulings. Keep all shipment tracking, customer correspondence and refund records for six years per HMRC rules, and for dispute evidence.
Q: Are there UK-specific fraud considerations?
A: Stripe Radar, PayPal’s fraud engine and Adyen’s RevenueProtect all score each transaction in real time. For UK-focused stores, tune fraud rules to expect UK cards, UK billing addresses and UK shipping addresses as the baseline — then flag outliers (international cards, mismatched shipping/billing, high cart value + new customer) for extra scrutiny. Most gateways let you auto-block, auto-review or force-SCA on flagged transactions.
Q: Should I buy a separate Merchant Account, or is a gateway enough?
A: Gateways like Stripe, PayPal and Square include a merchant account layer internally — you don’t need a separate one. This is the “aggregator” model. Worldpay and Adyen offer both aggregator and direct acquirer relationships. For UK SMEs, an aggregator gateway is the simpler and cheaper choice until volumes justify negotiating direct acquirer rates.
Q: Does the gateway or WooCommerce handle PCI DSS compliance?
A: When using hosted fields (Stripe Elements, PayPal iframe, Square Checkout), card details never touch your WooCommerce server. This puts your store in the simplest PCI DSS scope: SAQ-A. Your hosting infrastructure also needs to meet baseline standards (TLS 1.2+, secure headers, no cleartext transmission) — SmartXHosting’s default WooCommerce configuration ticks all the boxes.