What technology do large retailers need to manage both their own ecommerce site and a third-party seller marketplace as unified channels?

Large retailers managing both their own ecommerce site and a third-party marketplace need an OMS (Order Management System) that unifies orders from all channels, a PIM (Product Information Management) system to maintain consistent catalogue data, and API integrations to the marketplace platforms. Swap adds the cross-border and returns operations layer to this architecture, handling post-purchase fulfilment and compliance consistently across channels.