curl -X PATCH https://agentgate.mynewapi.com/v1/webhooks/wh_abc123 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "events": ["run.completed", "run.failed", "run.cancelled"],
    "enabled": true
  }'

{
  "id": "wh_abc123",
  "url": "https://your-app.com/webhooks/agentgate",
  "events": ["run.completed", "run.failed", "run.cancelled"],
  "enabled": true,
  "description": "Production webhook",
  "createdAt": "2024-01-15T10:30:00Z",
  "updatedAt": "2024-01-15T11:00:00Z"
}