What is not in here, and why
This is a manual for running the integration, not a specification for building one. The internals stay out on purpose: the call sequence the connector makes to EAIWS, how the webhook token is composed and verified, the field by field shape of the catalogue endpoints, and the message contract the ERP bridge speaks. Those exist and they are documented, they are just not published.
If you are building an adapter for a platform we do not cover yet, that material is what you get under agreement, and it is a real conversation rather than a brush-off. The three contracts are versioned, their shapes are pinned by tests, and every answer carries the version it was built against, so an adapter can tell when the ground moved under it.
What you will find here instead is everything you need to operate, diagnose and maintain a connection without us in the room, which is the part that actually decides whether this is pleasant to own.
Current contract versions. Catalogue catalog/1, bridge bridge/1, updates updates/1. Every gate response carries its version in a header. Fields may be added within a version; renaming or removing one means a new version. These numbers are read straight out of the running configuration when this page is built, so they cannot quietly fall behind.