Buy now pay later has gone from a niche payment option to a mainstream expectation in UK ecommerce. Over 17 million UK consumers have used a BNPL service, and that number continues to grow year on year. For Shopify store owners, offering BNPL is no longer optional if you want to compete for customers who expect flexible payment choices at checkout.
The mechanics are simple: the customer receives their order immediately and pays in instalments over time. You, the merchant, get paid upfront minus a small fee. The BNPL provider takes on the credit risk. It is a genuine win-win when implemented correctly, increasing your conversion rate and average order value whilst giving customers the flexibility they increasingly demand.
This guide walks you through setting up the major BNPL options on Shopify, from Shop Pay Instalments to Klarna and Clearpay, including the product page messaging, checkout integration, and strategic considerations that determine whether BNPL actually improves your bottom line.
What is buy now pay later and why it matters
Buy now pay later allows customers to split the cost of their purchase into smaller payments, typically three or four interest-free instalments over six to eight weeks. The customer pays the first instalment at checkout and receives their order immediately. The remaining payments are collected automatically on a defined schedule.
Why customers use BNPL
The appeal is straightforward. A customer considering a £120 purchase may hesitate at the full price but feel comfortable committing to four payments of £30. This is not just about affordability. Many BNPL users can afford to pay upfront but prefer the cash flow flexibility of spreading payments across their monthly budget. Research shows that BNPL users span all income brackets, not just those who cannot afford to pay in full.
The merchant benefit
As the merchant, you receive the full payment upfront minus the BNPL provider's fee, typically 3-6% of the transaction value. You do not take on any credit risk whatsoever. If the customer fails to make their instalments, that is between them and the BNPL provider. From your perspective, it is a completed sale paid in full at the point of order.
Impact on UK ecommerce
UK BNPL adoption has accelerated rapidly since 2020. Fashion, beauty, and homeware categories see the highest usage rates, but adoption is growing across all verticals including food subscriptions, electronics, and fitness equipment. Customers increasingly expect BNPL as a standard payment option, and stores that do not offer it risk losing sales to those that do. This is especially true for products priced between £50 and £500, the sweet spot where splitting payments feels most useful to customers.
BNPL providers available for UK Shopify stores
Several BNPL providers integrate with Shopify. Each has different fee structures, customer demographics, and technical integrations. Here is how they compare for UK merchants.
Shop Pay Instalments
Shopify's own BNPL solution, powered by Affirm. It integrates seamlessly with Shopify's checkout and requires minimal setup. Available for UK stores using Shopify Payments, it offers bi-weekly or monthly payment options. The advantage is deep, native integration. It works within the Shopify checkout without redirecting customers to a third-party site, which reduces friction and abandonment during the payment step.
Klarna
The largest BNPL provider in Europe with over 150 million global users. Klarna offers three products for UK merchants: Pay in 3 (three interest-free instalments), Pay Later (pay the full amount in 30 days), and Financing (longer-term credit for higher-value purchases). Klarna has strong brand recognition among UK consumers, which can increase adoption rates. Their Shopify integration is mature, well-documented, and actively maintained.
Clearpay (Afterpay)
Owned by Block (formerly Square), Clearpay splits payments into four interest-free fortnightly instalments. It has a younger demographic skew and particularly strong adoption in fashion and beauty categories. The integration with Shopify is straightforward, and they offer product page widgets that dynamically show the instalment amount based on the current product price.
PayPal Pay in 3
If you already accept PayPal on your Shopify store, Pay in 3 may be available automatically to eligible customers. It allows customers to split purchases between £30 and £2,000 into three interest-free payments. The advantage is the existing trust and ubiquity of PayPal as a payment brand that virtually every UK consumer recognises.
Choosing between providers
Consider your target demographic, average order value, and the provider's fee structure. For fashion-forward younger audiences, Clearpay has the strongest brand recognition. For broader demographics across age ranges, Klarna's range of products offers more flexibility. For seamless Shopify integration with minimal setup, Shop Pay Instalments is the most native option. Many stores offer multiple BNPL options to cover different customer preferences and maximise adoption.
Setting up Shop Pay Instalments
If you are eligible, Shop Pay Instalments is the simplest BNPL to implement because it is built directly into Shopify's payment infrastructure. No third-party app installation is needed.
Step 1: Check eligibility
Shop Pay Instalments is available through Shopify Payments. Go to Settings > Payments in your Shopify admin. If you use Shopify Payments and are in an eligible region, you will see an option for Shop Pay Instalments. If the option does not appear, your store may not yet be eligible based on region, plan, or business category.
Step 2: Enable instalments
Toggle the Shop Pay Instalments option on. Review the terms and fee structure carefully. Fees are typically deducted from each transaction alongside your regular Shopify Payments processing fees.
Step 3: Configure instalment options
Choose which instalment plans to offer. Options typically include bi-weekly payments and monthly payments. Set minimum and maximum order values for instalment eligibility. Products priced below your minimum threshold will not show the instalment option, which is useful for preventing BNPL on very low-value items where the per-instalment amount would be trivially small.
Step 4: Add product page messaging
Shopify automatically adds instalment messaging to product pages when Shop Pay Instalments is enabled. You should see a message below the price showing something like "or 4 interest-free payments of £25.00 with Shop Pay". If this does not appear automatically, check your theme's product template settings and ensure the dynamic checkout button or payment messaging section is enabled.
Adding Klarna to your Shopify store
Klarna is the most popular third-party BNPL provider for UK Shopify stores. Here is how to set it up step by step.
Step 1: Create a Klarna merchant account
Visit the Klarna merchant portal and apply for a merchant account. You will need to provide business details including company registration, expected transaction volumes, average order value, and banking information. Approval can take a few business days depending on your business profile and category.
Step 2: Install the Klarna app from the Shopify App Store
Search for "Klarna" in the Shopify App Store and install the official Klarna Payments app. Connect it to your Klarna merchant account using the API credentials provided during registration. The app will guide you through the connection process.
Step 3: Configure payment methods
In your Shopify admin under Settings > Payments, you will see Klarna appear as an alternative payment method. Enable the Klarna products you want to offer: Pay in 3, Pay Later, or Financing. Each product has different eligibility criteria, customer experience, and fee structures.
Step 4: Add on-site messaging
Klarna provides widgets and banners for product pages, collection pages, and cart pages that show customers how much their instalments would be. Install these through the Klarna app settings. The messaging dynamically calculates the instalment amount based on the product price, updating in real-time as customers select different variants or quantities.
Step 5: Test the integration
Place test orders using Klarna's sandbox environment to verify the checkout flow works correctly. Check that the instalment messaging displays accurately on product pages, that Klarna appears as an option at checkout, that the redirect to Klarna and back works smoothly, and that orders are processed and reflected in both your Shopify admin and Klarna merchant dashboard.
Adding Clearpay to your Shopify store
Clearpay's setup process follows a similar pattern to Klarna but with its own merchant application and integration steps.
Step 1: Apply for a Clearpay merchant account
Apply through the Clearpay merchant portal at their business website. Provide your business details, Shopify store URL, expected volumes, and product category information. Clearpay reviews applications based on business category, projected volume, and risk profile. Fashion and beauty brands typically have the fastest approval.
Step 2: Install the Clearpay Shopify app
Install the official Clearpay app from the Shopify App Store. Connect it to your Clearpay merchant account using the credentials provided.
Step 3: Enable at checkout
Add Clearpay as an alternative payment method in your Shopify payment settings. The app handles the checkout integration, redirecting customers to Clearpay for a quick approval process before returning them to your store for order confirmation.
Step 4: Add product page widgets
The Clearpay app includes widgets that display "or 4 interest-free payments of £X with Clearpay" on product pages. Configure the placement and styling through the app settings to match your store design and brand aesthetic.
Adding BNPL messaging to product pages
The single most important factor in BNPL adoption is visibility. If customers do not know BNPL is available until they reach the checkout page, you miss most of the conversion benefit that BNPL provides.
Where to display BNPL messaging
The most effective placement is directly below the product price on the product page. When a customer sees "£120 or 4 payments of £30 with Klarna", the instalment option immediately reframes the purchase decision. Additional placements that improve visibility include collection pages showing per-instalment prices, the cart page with a BNPL summary, a site-wide announcement bar mentioning BNPL availability, and banner advertising on your homepage highlighting flexible payment options.
Dynamic pricing in BNPL messages
BNPL widgets should automatically calculate the instalment amount based on the current product price, including any active discounts. If you use discount codes or compare-at pricing, verify that the BNPL messaging updates to reflect the discounted price rather than the original full price. Displaying incorrect instalment amounts erodes trust immediately.
Styling BNPL widgets to match your theme
Most BNPL providers offer styling customisation for their product page widgets. At minimum, ensure the widget text is readable against your theme background colour, the provider's logo displays correctly at the right size, and the widget does not disrupt your product page layout or push critical elements below the fold. Some providers offer a "text only" option that integrates more subtly.
Checkout integration and payment flow
The checkout experience varies significantly by provider. Understanding the flow helps you set customer expectations correctly and reduce drop-off during the payment step.
Shop Pay Instalments flow
Customers select Shop Pay at checkout and see instalment options within the Shopify checkout interface. No redirect to an external site is needed. This is the smoothest possible experience because the customer stays within your checkout throughout the entire payment process.
Klarna and Clearpay flow
With third-party BNPL providers, the customer is typically redirected to the provider's site or prompted to open the provider's app for a soft credit check and payment authorisation. Once approved, they are returned to your order confirmation page. This redirect adds a step but is standard practice and most customers are now accustomed to it from other online shopping experiences.
Handling declined BNPL applications
Not every customer will be approved for BNPL. Ensure your checkout falls back gracefully to standard payment options if the BNPL application is declined. The customer should be able to pay with a card, PayPal, or other available method without having to restart the checkout process from scratch. This is usually handled automatically by Shopify's checkout system, but test it to confirm.
How BNPL affects conversions and AOV
The business case for BNPL centres on two key metrics: conversion rate and average order value. Here is what the research and real-world data consistently shows.
Conversion rate impact
Industry research consistently reports that offering BNPL increases conversion rates by 20-30%, with the strongest impact on higher-priced products where the full upfront cost creates purchase hesitation. The effect is most pronounced for new customers who have no established trust with your brand, and for products in the £50-£500 range. Below £50, the instalment amount is small enough that most customers simply pay upfront. Above £500, longer-term financing options may be more appropriate than short-term BNPL.
Average order value impact
Customers who use BNPL tend to spend more per order than those paying in full. The typical AOV increase ranges from 15-30% across industries. This makes sense psychologically: when the perceived immediate cost is lower (a £30 instalment versus a £120 full price), customers are more willing to add extra items or upgrade to a higher-priced option. This AOV increase is one of the key ways BNPL pays for itself despite the higher transaction fees. For more strategies to increase AOV, see our average order value guide.
Return rate considerations
One legitimate concern with BNPL is potentially higher return rates. Some studies suggest BNPL orders have marginally higher return rates, particularly in fashion where customers may order multiple sizes with the intention of returning some. Monitor your return rate segmented by payment method and factor this into your overall ROI calculation. If BNPL increases your return rate significantly, you may need to adjust your returns policy or tighten eligibility.
Understanding BNPL fees and costs
BNPL is not free for merchants. Understanding the fee structure is essential for determining whether it makes financial sense for your specific business and price points.
Typical fee structures
BNPL providers charge merchants a percentage of each transaction, typically 3-6% plus a small fixed fee per transaction. This is higher than standard card processing fees, which run at 1.4-2.9% for most UK Shopify merchants. The exact rate depends on your negotiating power, monthly transaction volume, average order value, product category, and which provider you choose.
Calculating the ROI
The additional fee needs to be weighed against the incremental revenue BNPL generates. If BNPL increases your conversion rate by 20% and your AOV by 15%, the additional revenue typically far exceeds the extra fee cost. The formula is straightforward: additional revenue from BNPL-driven sales, minus the additional fees on those BNPL transactions, minus the cost of any increase in returns, equals the net benefit to your business.
Negotiating better rates
As your BNPL volume grows, negotiate better rates with your provider. Larger merchants processing significant monthly BNPL volume can often secure rates below 4%. Some providers offer volume-based tiered pricing that decreases as your monthly transaction value increases. Shopping between providers and getting competing quotes also gives you negotiating leverage.
Optimising the customer experience
A smooth BNPL experience starts well before checkout and extends through the entire purchase journey.
Clear product page communication
State the number of instalments, the exact amount of each instalment, and that it is interest-free. Avoid vague language. "4 interest-free payments of £30" is clear and compelling. "Flexible payment options available" is vague and does not communicate the actual benefit or reassure customers about cost.
FAQ and trust building
Add a dedicated section to your FAQ page covering BNPL questions that customers commonly have: how the payment schedule works, whether there is a hard or soft credit check, what happens if a payment is missed, which providers you accept, and whether BNPL affects credit scores. This reduces friction for customers who are new to BNPL or cautious about using it.
Post-purchase communication
While the BNPL provider handles payment reminders and instalment collection, your order confirmation and shipping emails should acknowledge the payment method chosen. A simple note confirming the order and reminding the customer of their payment schedule reinforces clarity and reduces post-purchase anxiety.
UK compliance and regulatory considerations
BNPL regulation in the UK has evolved significantly. As of 2026, the FCA has introduced rules governing BNPL lending that affect both providers and the merchants who offer BNPL as a payment option.
Current regulatory landscape
BNPL providers in the UK are now subject to FCA regulation, which means mandatory affordability checks before approving customers, clearer information requirements for consumers about payment schedules and consequences of missing payments, and standardised complaint and redress processes. As a merchant, your primary obligation is to present BNPL options clearly and accurately on your site. Do not make misleading claims about the terms or minimise the financial commitment involved.
Responsible messaging
Ensure your BNPL messaging does not encourage irresponsible spending. Phrases like "Why wait? Buy it now and worry about paying later" are problematic under current regulations. Stick to factual descriptions of how the payment works, the schedule, and any conditions. Your BNPL provider will typically supply compliant messaging templates and widgets that meet regulatory requirements.
Data and privacy
BNPL providers collect customer financial data as part of the credit assessment process. Ensure your privacy policy accurately reflects the data sharing that occurs when customers use BNPL at your checkout. The provider handles the credit assessment, but your site facilitates the initial data transfer and referral.
Measuring BNPL performance
Once BNPL is live on your store, track its impact systematically rather than assuming it is working.
Key metrics to monitor
- BNPL adoption rate. What percentage of total orders use BNPL? Track by product category and price range to understand where BNPL is most popular.
- Conversion rate by payment method. Compare conversion rates for customers who use BNPL versus those who pay with standard methods.
- AOV by payment method. Quantify the actual AOV uplift from BNPL orders versus non-BNPL orders.
- Return rate by payment method. Monitor whether BNPL orders have higher return rates than standard payment orders.
- Net revenue impact. Calculate total additional revenue generated by BNPL, minus additional fees paid to providers, minus the cost of any increase in returns, to determine the genuine net impact on your bottom line.
Use your Shopify analytics and payment reports to segment performance by payment method. Review the data monthly and adjust your BNPL strategy based on what the numbers actually show.
Buy now pay later is not just a payment method. It is a conversion optimisation tool that reframes the purchase decision in the customer's mind. When a £120 product becomes four payments of £30, the psychological barrier drops dramatically. Set it up, measure the impact, and let the data guide your strategy.
Andrew Simpson, Founder
Setting up buy now pay later on Shopify is a relatively quick technical implementation with a potentially significant impact on your revenue. Start with one provider, add product page messaging to make it visible, measure the results over a few weeks, and expand from there. The key is visibility — make sure customers know BNPL is available before they reach checkout, not at checkout itself.
If you need help integrating BNPL with your Shopify store or want to optimise the implementation for maximum conversion impact, get in touch. We can help you choose the right provider and configure the integration for your specific needs and customer base.
