Lemonway is a French payment institution that provides modular payment services to marketplaces, e-commerce sites and crowdfunding or alternative-finance platforms. Its offer covers pay-in, user identification, wallets, pay-out, a real-time dashboard and plugins, for example for Mirakl and Adobe Commerce. The service is delivered as an API with documentation and code examples, so platforms build the payment flow into their own product. Lemonway is not open source.
Lemonway is headquartered in Paris, with a second site in Hamburg. It has been regulated as a payment institution by the French authority ACPR since 2012 and holds a European passport. Its public pages do not state where customer data is hosted, so ask for hosting and subprocessor details when contracting. Because Lemonway hosts the service itself and it cannot be run on your own infrastructure, the regulatory and operational dependency stays with the provider.