curl "https://server.smartlead.ai/api/v1/crm/leads/notes/123?api_key=YOUR_KEY"

{
  "ok": true,
  "data": [
    {
      "id": 456,
      "lead_id": 123,
      "note_message": "Spoke with lead, interested in enterprise plan",
      "created_by": "John Doe",
      "created_at": "2025-12-01T10:30:00.000Z"
    }
  ]
}

{
  "message": "Invalid API Key"
}