Maesn is the Unified API for ERP and Accounting integrations, built to help software teams connect with complex enterprise systems - fast, reliably, and at scale. Software increasingly relies on deep integrations with ERP and accounting systems to drive adoption, retention, and growth. However, building and maintaining these integrations in-house is slow, costly, and operationally complex. Maesn removes this burden by providing a single, standardized API that connects software products to dozens of ERP and accounting systems across Europe. With Maesn, product and engineering teams build one integration instead of many. Our Unified API abstracts system-specific complexity through a common data model, unified authentication. This allows teams to ship integrations in days instead of months - without worrying about system- or country-specific requirements, legacy ERP architectures or ongoing maintenance. Maesn is designed for enterprise-grade use cases, including invoicing, accounts payable and receivable automation, expense synchronization, financial analysis, and bidirectional ERP workflows. Data can be read from and written back to connected systems while maintaining financial accuracy, consistency, and compliance. Real-time synchronization replaces manual CSV imports and exports, improving data quality and end-user experience. Security and compliance are at the core of Maesn. We are ISO 27001 certified, GDPR compliant, made in Europe and hosted in Germany. Maesn follows a security-by-design approach and does not store any data, ensuring customers remain fully in control of their information. For go-to-market teams, integrations powered by Maesn become a growth lever. Software vendors increase ACV, shorten sales cycles, improve win rates, and unlock new customer segments by offering native ERP and accounting integrations without engineering bottlenecks. Customer Success teams benefit from faster onboarding, higher adoption, and reduced support overhead thanks to reliable, production-ready integrations. Maesn is trusted by leading software companies building for the complex European software landscape. Whether you’re launching your first integration or scaling to dozens of systems, Maesn provides the infrastructure to make enterprise software truly interoperable - without the complexity.