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The plan codes gain STARTER, the tier between FREE and PRO introduced with the 2026-08 pricing. upgrade_to, on a 402 and on a question the caller's plan does not cover, can name it, and so can quota_tiers[].plan_code on GET /public/v1/limits. A client that switches over plan codes needs a branch for STARTER; the other codes keep their meaning and their order.

An event stranded by an auto-disable is now dead-lettered, so it can be replayed once the endpoint is back. Recovering from a bad afternoon is supposed to be: the platform pauses the endpoint, you fix it, you re-enable it, you redeliver what never arrived. Redelivery only accepts a dead-lettered delivery, and the queue of an auto-disabled endpoint was being terminated as merely failed — so there was nothing to replay and nothing said so. The arithmetic hid it: a delivery gets 8 attempts and an endpoint is paused after 10 consecutive failures, so a single event in flight always dead-letters first. The counter is per endpoint, and one ordinary session emits three events. Deliveries for an endpoint its owner REMOVED are still terminated without a dead letter: nobody is coming back for those.

Three corrections found by driving this API the way an integration does. A bad request body now answers the envelope this surface documents ({ error, code: INVALID_REQUEST_BODY, invalid_fields }) naming the PUBLISHED field: it used to fall through to a shape the API emits nowhere else, which named the internal property (TargetUrl for target_url) and carried no error member for a generated client to read. session.ended is delivered ONCE per close; closing a live session through this API delivered it twice, so anything that posts a summary or books a room did it twice, and the event now always names presentation_id whichever surface closed the session. And enabling an endpoint only revives one the platform paused after failures: it used to undo a DELETE too, so a connector's unsubscribe could be reversed by one call while the connector itself could no longer remove it. Enabling an endpoint that was removed now answers 400 WEBHOOK_NOT_AUTO_DISABLED; register it again instead.