unknown_event_type

The webhook event type is not in the event catalog.

HTTP 400.

Likely causes:

• Triggering a test event (POST /v1/webhook-events/trigger) with a type that does not exist.
• Filtering a webhook listener’s events with a type or family that does not exist.

What to do: Use a type from GET /v1/webhook-event-types, or a family wildcard such as trade.*.

Retry: No. The same request gets the same answer; change something first.

Listed under Webhooks in Errors. Send the error’s requestId to support and we can find the request.