E-commerce is usually seen as the classic product sale within an online shop. Many platforms are now turning into marketplaces, and increasing in complexity. In the tourism sector, that complexity is multiplied through diverse travel arrangements, hotel rooms and services offered. This creates new demands for a customer-centric travel-commerce platform. In this talk, Alexander Kempkens reports on what DER Touristik has learned and how it meets these requirements. He discusses how solutions such as Magnolia are used and how customer preferences are incorporated into the products and purchase journeys.