This was an early move towards phasing out an old home grown ecommerce and operations system. It is an e-commerce system, but it also serves as part of a conduit for sales and stock data flows between various other sites and the internal system.
It utilises webhooks, the Woocommerce REST API, a node-red service on a separate VM, and internal operations system code to coordinate product stock levels and sales data between sites. In all that it manages to do everything the standard WordPress way without any hacks.
Related blog posts: