200 OK with { "confirmation": … }: the full confirmation object, including events. The sample on the right is abridged to the fields that changed after a call in which the customer moved to another slot.
An id that doesn't exist, or isn't in the right format, returns 404 with "error": "No confirmation with that id.".
You don't need to: the webhook tells you when there's an outcome. Retrieve is for showing the live timeline to your team, for checking the state after a missed webhook, and for pulling the transcript into your customer-service tool.
Base URL https://api.anyonein.co.uk/v1 is a placeholder until the production domain is confirmed. Found a mistake? Tell us.