We present the design and evaluation of an Enterprise Marketplace that unifies web-based access to multi-cloud and enterprise products within a large banking infrastructure. Building such a platform poses significant technical and organizational challenges, including the generalization of diverse APIs and the accommodation of heterogeneous user profiles. Our solution enables autonomous product publishing via a no-code interface, enforces multi-layered governance to ensure security and compliance, and integrates disparate providers through a standardized API. We demonstrate how this approach enhances product quality, producer autonomy, and user experience, supported by adoption metrics and operational data from a real-world deployment. Finally, we reflect on key lessons learned and persistent challenges after a decade of production use, serving over 200,000 users.