Dispatches a completion.created event with _test: true in the data payload. The delivery uses the same HMAC signing, SSRF checks, and retry logic as real events.
{ "id": "evt_abc123...", "type": "completion.created", "created": "2026-04-15T12:00:00.000Z", "data": { "_test": true, "message": "This is a test event from Theo. If you received it, your webhook is working!" }}
Use the delivery log to check whether the test was delivered successfully.