curl -sS --fail-with-body -X POST \
  "https://ark.cn-beijing.volces.com/api/v3/webhook_endpoints/$WEBHOOK_ENDPOINT_ID/test" \
  -H "Authorization: Bearer $ARK_API_KEY"

HTTP/1.1 200 OK

{
  "type": "event",
  "id": "whe-20261012080500-f6g7h",
  "created_at": "2026-10-12T08:05:00Z",
  "data": {
    "type": "webhook.test",
    "id": "wep-20261012080000-a1b2c"
  }
}