Ecommerce Merchant Accounts and Online Payment Processing UK 2026

Updated August 2026. An ecommerce merchant account is the part of the payment setup that allows an online business to accept card payments and receive the proceeds. In practice, many modern payment providers package the merchant account, gateway and processing together, so a small business may never need to arrange each component separately.

The buying decision is therefore less about finding an old-fashioned “merchant account” in isolation and more about choosing the right online payment provider, checkout, security model and pricing structure for your website.

What is an ecommerce merchant account?

Traditionally, the merchant account is a special account used during the settlement process. If you want the broader terminology explained first, start with our merchant accounts guide. used during the card-payment settlement process. It sits between the customer’s card payment and the money reaching the merchant’s normal business bank account.

Today, payment service providers often hide much of that complexity. You sign up to one platform, integrate its checkout and receive settlement according to the provider’s terms.

This is why a new Shopify, WooCommerce or custom-site merchant may talk about choosing Stripe, Square or PayPal rather than separately applying for a merchant account and gateway.

Merchant account versus payment gateway

They are related but not identical.

• Merchant account or acquiring arrangement: handles the merchant side of card acceptance and settlement.
• Payment gateway: securely passes online payment information between the checkout and the payment-processing systems.
• Payment service provider: can package several of these functions into one service.

See our online payment gateway guide for the gateway side in more detail.

Do small ecommerce businesses need a dedicated merchant account?

Not necessarily. A startup can often launch faster through an aggregated payment service provider. Our payment processing companies guide compares the main provider types. through an aggregated payment service provider with public pricing and a simple online application.

A dedicated or more tailored merchant arrangement becomes more relevant when:

• monthly volume is high;
• average order value is high;
• the card mix is unusual;
• the business is considered higher risk;
• you need negotiated acquiring terms;
• you operate across several countries;
• you need advanced settlement or reconciliation.

Square for ecommerce

Square currently charges 1.4% + 25p for UK-card online transactions and 2.5% + 25p for non-UK cards. The pricing applies to online checkout through its supported ecommerce tools.

Square is particularly useful where a business also sells face to face because online and in-person payments can sit in one ecosystem.

See Square

Stripe for ecommerce

Stripe is one of the main benchmarks for developer-led online payments. Its current UK standard pricing lists 1.5% + 20p for standard UK cards and higher rates for premium or international categories.

Stripe’s biggest strength is flexibility. It supports APIs, recurring billing, marketplaces, subscriptions and a wide range of payment methods.

A straightforward local retailer may not need that level of control. A software company or marketplace might.

SumUp online payments

SumUp currently charges 2.50% for standard online payments such as Payment Links and relevant online checkout products.

This is higher than its 1.69% PAYG in-person rate, so a business using SumUp for its shop should still compare other providers before automatically using it for the website.

Read our SumUp fees guide.

PayPal and Braintree

PayPal remains important because customers recognise the PayPal wallet and many merchants already use it. PayPal’s wider business platform includes online checkout, payment links, card processing and Braintree for more customised integration.

Current UK Braintree standard pricing lists 1.9% + 20p for standard UK cards and third-party digital wallets, with different pricing for American Express and other categories.

Use PayPal because its checkout and customer reach suit the business, not simply because the brand is familiar.

How much does the fixed pence fee matter?

Online pricing often combines a percentage with a fixed pence charge. This makes average order value important.

At 1.5% + 20p:

• a £10 order costs 35p;
• a £25 order costs 57.5p;
• a £50 order costs 95p;
• a £100 order costs £1.70.

The fixed 20p is 2% of a £10 order but only 0.2% of a £100 order. High-volume low-ticket ecommerce businesses should therefore pay close attention to fixed transaction fees.

What does an online payment actually need to support?

Do not choose only by Visa and Mastercard pricing. Depending on your customers, you may also need:

• Apple Pay;
• Google Pay;
• PayPal;
• local payment methods;
• bank payments;
• Buy Now Pay Later;
• subscriptions;
• saved cards;
• multi-currency checkout.

Every extra payment method should have a commercial reason. More buttons are not automatically better if they confuse checkout or add expensive fees.

Hosted checkout versus taking card details yourself

For most SMEs, use a provider-hosted or properly tokenised checkout rather than building a system that directly handles raw card data.

This reduces technical security risk and can reduce the scope of your PCI DSS responsibilities. It does not remove all responsibility for website security.

PCI DSS v4.0.1 and ecommerce

PCI DSS v4.0.1 is the current payment-card security standard. The remaining future-dated requirements became effective from 31 March 2025.

Ecommerce merchants using SAQ A should be aware that the eligibility criteria were tightened around protection from malicious scripts. Using a hosted payment page does not mean the rest of your ecommerce website can be ignored.

Read our PCI DSS guide.

Strong Customer Authentication

UK online card payments can be subject to Strong Customer Authentication requirements. In practice, your gateway or payment provider normally handles the technical 3-D Secure flow.

The checkout should apply authentication when required without creating unnecessary friction for every customer.

Fraud and chargebacks

Online card transactions carry more fraud risk than a normal Chip & PIN sale. For the wider processing side, see our credit card processing guide. than a normal Chip & PIN sale. Compare providers on:

• 3-D Secure support;
• fraud screening;
• risk rules;
• chargeback alerts;
• evidence submission;
• dispute fees;
• account reserves where relevant.

A provider that costs 0.1% more but prevents meaningful fraud losses can be better value.

High-risk ecommerce businesses

Some sectors are harder to place because of refund patterns, regulatory risk or higher chargebacks. Our high-risk merchant account guide explains this in more detail., regulatory risk, subscription models, fulfilment times or historically high chargeback levels.

A higher-risk merchant may face:

• higher processing rates;
• rolling reserves;
• longer settlement;
• stricter underwriting;
• volume caps;
• additional documentation.

See our high-risk merchant account guide.

Documents you may be asked for

Provider onboarding varies, but established or higher-risk businesses can be asked for company details, identity documents, ownership information, business-bank details, website terms, refund policy, fulfilment information and processing history.

Have this ready before applying if you need the account live quickly.

Settlement and cash flow

Online merchants should check how long funds take to reach the operating bank account and whether a provider can delay settlement following risk reviews or disputes.

This matters particularly where you pay suppliers before the customer payment has fully settled.

International ecommerce

Cross-border selling adds card and currency costs. Square, Stripe, PayPal and other providers price international cards differently from domestic cards.

Also check:

• supported settlement currencies;
• FX fees;
• local payment methods;
• international dispute handling;
• tax and consumer-law obligations in the target market.

How to compare two ecommerce quotes

Use the same inputs for both providers:

• monthly online turnover;
• number of orders;
• average order value;
• UK versus overseas card share;
• refund rate;
• chargeback rate;
• currency mix;
• subscription or recurring-payment share.

Then compare the total likely monthly cost rather than one advertised percentage.

Example: £20,000 monthly online sales

Imagine 800 UK-card orders totalling £20,000.

• At 1.4% + 25p: £280 percentage fee + £200 fixed fees = £480.
• At 1.5% + 20p: £300 percentage fee + £160 fixed fees = £460.

The second structure is cheaper in this simplified example despite its higher percentage because the pence fee is lower.

Change the order count or average basket and the answer can change too.

Related Quotehunt guides

• Online payment gateways
• Payment processing companies
• Credit card processing
• PCI DSS for small businesses
• High-risk merchant accounts
• Business bank accounts

Our verdict

For a straightforward UK ecommerce startup, compare Square and Stripe first because their public pricing makes the initial cost easy to model. Existing SumUp or PayPal users should also price the online option already available in their ecosystem.

As volume grows, ask for tailored acquiring pricing and pay more attention to fraud, settlement and integration. The best ecommerce merchant account is the arrangement that supports your checkout securely and produces the lowest sustainable total cost after card mix, fixed fees and disputes are included.

Also see our payment processing companies guide and credit card processing guide.