Switzerland's mobile payment platform: Unified SDK and plugin suite for WooCommerce, Shopware, and Magento. Consistent merchant experience across all channels.

The Challenge

The client’s growth trajectory is directly tied to merchant adoption. Every merchant that activates the client in their online store extends the network, deepens the client’s position in Swiss e-commerce, and increases the transaction volume flowing through the platform. The problem was that the path for merchants to activate the client was fragmented and inconsistent. Different e-commerce platforms: Shopware, WooCommerce, and Magento had different plugins with inconsistent behaviour, uneven reliability, and varying levels of integration depth with the client's core platform. Merchants encountered different onboarding experiences depending on their shop system, and inconsistencies in plugin performance were generating disproportionate support overhead. The fragmentation was holding back adoption and increasing friction for the merchant relationships that drive the client’s network expansion. Beneath the merchant experience problem was an architectural one. The existing plugins had been developed externally and varied in their code quality, maintainability, and alignment with the client’s core platform architecture. Maintaining and updating them independently was accumulating technical debt across the most strategically important touchpoints in the merchant integration stack. The client needed to insource and standardize. The requirement was clear: a shared core that could power consistent, maintainable plugins across all major shop systems, developed to the client’s own standards and owned directly by the company.

The Approach

Gradion partnered with the client to engineer the unified solution from the ground up. The foundation of the work was a custom SDK encapsulating the core integration logic shared across all e-commerce environments. Rather than building and maintaining three independent plugins with three separate codebases, the SDK created a single authoritative layer for the business logic, authentication flows, transaction handling, and platform communication that every plugin relies on. This foundational layer enabled rapid, consistent plugin development and simplified future updates; changes to core behaviour propagate once, not three times. On top of the SDK, Gradion built and deployed plugins for Shopware, WooCommerce, and Magento, the three platforms most widely used by the client’s merchant base. Each plugin was developed to meet the specific technical requirements and conventions of its target platform while adhering to the unified integration standard defined by the SDK. The result is a consistent merchant experience regardless of which shop system a merchant operates. Standardizing the interface behaviour across platforms was a specific design priority: merchants interacting with the client across different shop systems encounter the same reliable, intuitive activation and checkout process. This consistency reduces support burden and builds confidence in the integration. By insourcing the previously external plugins and rebuilding them to internal standards, the client gained direct ownership and control of the codebase, eliminating the technical debt and consistency gaps that external development had introduced. The engagement did not end at launch. Gradion continues to maintain, enhance, and support the SDK and its plugin ecosystem, ensuring the technical foundation keeps pace with new platform versions, new merchant requirements, and the client’s own feature roadmap.