Mapping the commerce platform landscape and where to find opportunities
The ecommerce market is now split between out-of-the-box platforms and highly customised enterprise builds, each with its own adoption patterns, merchant profile, and integration demands.
For PSPs, that fragmentation is not a problem to be solved but potential opportunity.
In this piece, we break down the major commerce platforms by model, reach, and potential opportunity for payments providers looking to drive adoption and capture transaction revenue across the stack.
We’ve organised them to reflect both scale and merchant profile, from SME-heavy platforms through mid-market players to enterprise-focused solutions.
WooCommerce
WordPress’s commerce platform powers over 3 million live storefronts globally, serving a diverse mix from small stores to mid-market merchants, making it the most widely adopted open-source solution.
For PSPs, WooCommerce represents a massive install base but with highly customised environments. Most merchants rely on plugins rather than direct API builds, so a native extension can reduce integration friction and accelerate go-live.
Given its long tail of global merchants, even small revenue per merchant adds up to a large total.
Shopify
Shopify has more than 6.3 million active stores, spanning micro-merchants to enterprise brands, representing the largest aggregate payments volume in the market.
While individual merchant transactions are modest, the sheer number of stores makes Shopify a high-volume opportunity for PSPs.
Shopify has a finely tuned, recognisable checkout flow for all their sites. While checkout customisation is minimal, integration via a pre-built app is the only route available for PSPs.
Shopify’s approach to payment partnerships means that merchants can only use approved apps to process payments.
PrestaShop
PrestaShop has more than 180,000 live storefronts, mostly catering to small and medium-sized businesses in Europe, known for its flexibility and extensive marketplace of add-ons.
PrestaShop merchants typically run heavily modified builds with limited payments expertise in-house. A pre-built PSP extension would meaningfully reduce onboarding complexity and simplify recurring payment flows.
OpenCart
OpenCart powers around 200,000 stores, predominantly small and mid-market merchants looking for a lightweight, easy-to-manage open-source platform with low operational overhead.
OpenCart stores often have small technical teams and rely heavily on third-party plugins. For PSPs, a native extension with built-in payments features will help to cut integration time and support effort. Because the market is large, ease of adoption will drive conversions.
Adobe Commerce
With around 100,000 active storefronts spanning mid-market to enterprise, it’s favoured by merchants needing heavy customisation or B2B features.
Adobe Commerce merchants often have complex integrations across ERP, CRM, and fulfilment systems. For PSPs, delivering an extension that simplifies onboarding, multi-currency payments, and compliance out of the box can reduce implementation effort and accelerate merchant adoption.
BigCommerce
The platform has just under 40,000 live stores, with a strong mid-market and SMB focus and a growing enterprise tier.
Volume is moderate per merchant, but aggregated across thousands of stores, BigCommerce represents a significant payments revenue stream. Supporting B2B features and multi-channel sales further enhances the value proposition.
Agentforce Commerce
Agentforce Commerce (previously Salesforce Commerce Cloud) powers approximately 35,000 storefronts, predominantly for multinational retailers with complex omnichannel requirements.
Merchants often have complex integrations with CRM, ERP, and loyalty systems. PSPs can capture high-value transactions on Salesforce through advanced checkout customisation, personalisation, and multi-currency payments.
SAP Commerce Cloud
Geared towards enterprise and B2Bs, there are just over 3,600 live storefronts typically with deep ERP integration needs.
SAP Commerce Cloud merchants demand payments that integrate tightly with ERP systems, support multi-currency settlement, complex taxation, and end-to-end auditability.
commercetools
commercetools has just over 2,000 live sites, serving enterprise brands and retailers pursuing composable, API-first architectures.
Enterprise merchants are adopting headless architectures that require flexible, API-driven payments orchestration, and PSPs that offer a pre-built app can streamline integration while supporting complex payment flows.
Integration as a growth lever
Klarna’s integration strategy offers a blueprint.
By integrating across SAP Commerce Cloud and Salesforce Commerce Cloud, Klarna has reduced engineering effort by up to 88% compared with bespoke API builds. The result was faster go-live, increased merchant adoption, and higher transaction volume.
Merchants are understanding the benefits of favouring solutions that minimise integration complexity. For PSPs, pre-built apps and standardised connectors are strategic growth levers.
Strategic implications for PSPs
1. Scale with SME platforms
WooCommerce, PrestaShop, and Shopify together represent the largest total merchant volume. Margin per merchant may be small but PSPs win here through scale.
The goal here is reach and repeatability. Simplify setup, standardise extensions, and let merchants self-serve to build a steady revenue stream
2. Pre-built extensions for complex merchants
Mid-market and enterprise merchants require sophisticated integrations to handle recurring payments, multi-currency settlement, and system connectivity.
Pre-built extensions help to reduce onboarding friction, cut support costs, and speed up adoption, while API integrations ensure flexibility for merchants with complex needs.
This approach not only captures higher-value transactions but also creates long-term, stickier relationships that generate reliable, recurring revenue.