Changelog

Changes to the LineHQ Public API, its webhooks and its refusal body, newest first.

14 October 2026

The LineHQ Public API is documented in the open at linehq.co.uk/developers: an overview, the API reference, guides, a Markdown version of every page, and openapi.json.
Our promise. Documented endpoints, documented webhook payloads and the 403 refusal body won't change in a way that breaks your integration without an entry here and at least 90 days' notice. New fields and new endpoints can appear at any time, so ignore fields you don't recognise. Endpoints and fields that aren't documented carry no promise and can change without notice.