webhook_trigger_sandbox_only

On a live key only webhook.test can be triggered; other test events are sandbox-only.

HTTP 403.

Likely cause: POST /v1/webhook-events/trigger with a live key and an event type other than webhook.test.

What to do: Use a sandbox key (POST /v1/sandbox/keys) to trigger other event types, so a test trade never reaches a production handler.

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.