There’s a persistent assumption in e-commerce that conversion rate problems live in advertising, product pages, or pricing. The checkout is treated as infrastructure: something you configure once, hand to a developer, and stop thinking about.
The research doesn’t support that framing. A consistent body of evidence from Baymard Institute, McKinsey, ACI Worldwide, Worldpay, and platform-level data from Shopify points to the same conclusion: payment method availability and checkout design are active, measurable conversion variables, and most brands are leaving meaningful revenue on the table by treating them as static.
The Scale of the Problem
Start with the baseline. Baymard Institute’s aggregated research, drawing on 49 studies and their own large-scale UX testing programme spanning over a decade, puts the average global cart abandonment rate at 70.19%. Seven in ten shoppers who add an item to their cart don’t complete the purchase.
That figure has been remarkably stable across years and methodologies. What the research has gotten better at is diagnosing why.
- 70% Average global cart abandonment rate (Baymard Institute, 49-study aggregate)
- 61% of consumers abandoned a purchase in 2024 because their preferred payment method wasn’t offered (ACI Worldwide, 2024)
- 21% of e-commerce sites still only accept one payment method (Baymard Institute, payment method UX research)
The 61% figure from ACI Worldwide’s 2024 transaction analysis is worth pausing on. It comes from internal payment data rather than independent academic research, so treat it as directionally credible rather than a precise benchmark, but the direction is consistent with what Baymard finds in usability testing and what PYMNTS Intelligence identified in a separate February 2024 report: 70% of shoppers now prioritise payment method availability when deciding where to shop.
The combination of those data points tells a coherent story. Shoppers arrive at checkout with purchase intent. A mismatch between the payment method they expect and what the site offers is enough to end the session.
Where Payment Friction Actually Lives
Baymard’s checkout research identifies the primary abandonment drivers that brands can fix through design and configuration changes (excluding those who were never genuinely intending to buy). The payment-related causes cluster into three areas:
- Preferred method unavailable: The shopper reaches the payment step, and their expected option isn’t there
- Security concerns: 25% of shoppers in Baymard’s research cite distrust around entering card details as a reason for abandonment
- Checkout complexity: 22% cite a checkout process that's too long or complicated; Baymard found the average ecommerce checkout contains 11.3 form fields against an optimal target of around 7
Critically, these are not the same problem with the same solution. Adding more payment methods addresses the first. Displaying trust signals (recognised payment provider logos, SSL indicators) addresses the second. Reducing form fields and streamlining steps addresses the third. Brands that conflate them tend to solve one while leaving the others intact.
The Mobile Gap Makes This Urgent
The payment friction problem is not evenly distributed across devices. Mobile accounts for around 68% of all e-commerce traffic, but carries an 85% cart abandonment rate, the highest of any channel. Desktop abandonment, by comparison, runs at 67–70%.
The gap is partly behavioural. Mobile sessions are more fragmented, more interruptible, more likely to be exploratory rather than transactional. But a significant portion is structural: manual data entry on a small screen is genuinely worse. Typing card numbers, billing addresses, and CVV codes on a phone introduces errors, hesitation, and drop-off that simply doesn't occur at the same rate on desktop.
This is why accelerated checkout options, digital wallets and one-tap solutions, show their largest performance differential on mobile, not desktop. The friction they eliminate is where the abandonment was highest to begin with.
Worldpay’s Global Payments Report documents the trajectory: digital wallet usage in ecommerce more than doubled from 15% of payments in 2014 to 39% in 2024. They project that digital wallets will account for more than half of all US ecommerce payments by 2030. In Europe, the share is expected to reach 40% of total ecommerce transaction volume by 2027.
What The Accelerated Checkout Data Shows
The most cited performance data in this space comes from Shopify, which commissioned an external study by a Big Three management consulting firm in 2023. The findings: Shop Pay lifts conversion by up to 50% relative to guest checkout, outperforms other accelerated checkout options by at least 10%, and notably, the mere presence of the Shop Pay button increases lower-funnel conversion by 5% even when shoppers don't use it.
That last point deserves attention. A recognised payment option at checkout functions as a trust signal independent of whether the shopper actually selects it. The familiarity of the logo does some conversion work on its own.
What the independent research does confirm is the direction. McKinsey’s 2024 consumer digital payments study, which surveyed roughly 9 in 10 US and European consumers, found that 74% of US consumers and 71% of European consumers cited easier and faster checkouts as a primary reason to use digital payment methods. Separately, McKinsey found that consumers who start their shopping journey through BNPL platforms or aggregator marketplaces spend 1.5 to 2 times more than those who initiate at the merchant’s own site.
Source caveat: The Shopify/Big Three study is commercially funded, and the full methodology isn’t public. The 50% lift figure represents the top of the range, not the average. The same study puts the average Shopify checkout conversion improvement at 15% over competing platforms. Both figures are useful directional data, but neither should be quoted as a universal benchmark for all accelerated checkout implementations.
BNPL: Real Demand, Modest Share
Buy Now Pay Later gets more coverage than its current market share warrants, but that’s partly because its growth trajectory is real and its AOV effect is documented.
Current figures: BNPL accounts for approximately 5–6% of global ecommerce payment volume, up from under 2% in 2019. Global users reached around 380 million in 2024, with projections from Juniper Research pointing toward 670 million by 2028. The global transaction volume hit approximately $560 billion in 2025.
The conversion impact is most pronounced on higher-ticket items. ACI's data shows a 7% average conversion lift from adding a single relevant payment method, and BNPL’s lift is concentrated in categories where cart value creates hesitation: furniture, electronics, apparel above a certain price point. Below roughly £50–60, the BNPL effect largely disappears.
Digital wallets (Apple Pay, Google Pay, Shop Pay)
- Account for 39% of global ecommerce payments (2024).
- Have a high positive impact on conversion rates, particularly on mobile devices.
- Most important across all retail categories, with the strongest conversion uplift on mobile checkout journeys.
Buy Now, Pay Later (BNPL) services (e.g., Klarna, Clearpay)
- Represent approximately 5–6% of global ecommerce payments.
- Deliver a medium conversion impact, depending on order value.
- Most effective for higher-value purchases, especially in fashion, home goods, and electronics.
Credit and debit cards
- Remain the dominant payment method globally, although their share is gradually declining.
- Provide a baseline conversion benefit, largely through consumer trust in recognised card brands.
- Important across all sectors, but increasingly offer less differentiation compared with newer payment options.
Guest checkout
- Not a payment method, but a checkout option with a high impact on conversion.
- Reduces friction by removing the requirement to create an account before purchase.
- Valuable across all ecommerce categories.
- Research indicates that 26% of shoppers abandon checkout when forced to create an account.
Sources: Worldpay; Baymard Institute; ACI Worldwide; Juniper Research. Conversion impact figures are indicative ranges drawn from published research and should not be interpreted as controlled-study averages.
The ‘Too Many Options’ Problem Is Real Too
The research on payment variety is not a simple “more is better” story. ACI Worldwide and Baymard both note that beyond a certain point, option proliferation creates decision paralysis rather than removing friction. The practical consensus from available data: three to five payment methods is the range that balances coverage with cognitive simplicity.
The priority stack for most UK e-commerce brands based on current adoption data:
- Card (Visa/Mastercard): Table stakes
- At least one major digital wallet (Apple Pay and/or Google Pay): Now expected by a substantial share of mobile shoppers
- PayPal: Still the most recognised third-party payment brand for trust signalling
- BNPL: Warranted if average order value exceeds roughly £80–100 and the category involves considered purchases
Adding a fifth or sixth option below that core four has declining returns and starts to complicate the checkout UI. The question isn’t which payment methods exist. It’s which ones your specific customer base actually uses and expects.
What This Means for Paid Media
The relevance for performance marketers is direct.
Paid media can drive qualified traffic to a product page efficiently. If that traffic hits a checkout that doesn’t offer the payment method the shopper expects, or that creates friction through excess form fields and forced account creation, the conversion loss comes entirely out of your acquisition efficiency.
CPA goes up. ROAS goes down. And the problem is invisible in campaign reporting, because the drop-off happens at checkout rather than at the ad or landing page level. Attribution doesn't flag “shopper abandoned because Apple Pay wasn’t available.” It just records a non-conversion.
If you’re running paid campaigns and haven’t audited your checkout payment configuration recently, you're optimising the top of the funnel while potentially leaking at the bottom. The incremental cost of adding a digital wallet option is low. The conversion impact, particularly on mobile traffic, which is where most paid social lands, is among the highest-return checkout changes available.
The Honest Summary
The research base here is real, but it requires handling with care. Baymard is credible and methodologically rigorous on checkout UX. McKinsey is credible on consumer behaviour trends. Platform-funded studies from Shopify and ACI Worldwide are directionally useful but should be treated as upper-bound estimates rather than universal benchmarks.
With those caveats stated, the directional case is consistent across sources: payment method availability is a conversion variable, not a configuration detail. The mobile abandonment gap is structural. Digital wallet adoption is on a long-term growth curve that isn’t reversing. And the cost of auditing and improving your payment mix is low relative to what the research suggests it can recover.
Most e-commerce brands have spent more time A/B testing button colours than they have reviewing their checkout payment configuration. The data suggests that’s the wrong prioritisation.
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