Query webhook events

{
  "events": [
    {
      "id": "evt_xyz789",
      "uuid": "a1b2c3d4-e5f6-4a7b-8c9d-0e1f2a3b4c5d",
      "service": "outbound",
      "event_type": "outbound.delivered",
      "source_uid": "message-uid-123",
      "source_action": "ACCEPTED",
      "payload": {
        "to": "recipient@example.com",
        "from": "sender@example.com"
      },
      "webhook_url": "https://example.com/webhook",
      "created_at": 1704825600,
      "latest_status": "success",
      "total_attempts": 1,
      "last_response_code": 200
    }
  ],
  "total": 150,
  "limit": 50,
  "offset": 0
}

{
  "success": false,
  "error": "Invalid event_type"
}

{
  "success": false,
  "error": "User authentication not found"
}

{
  "success": false,
  "error": "Failed to query webhook events"
}