curl -X POST "https://server.smartlead.ai/api/v1/master-inbox/create-note?api_key=YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email_lead_map_id": 2433664091,
    "note_message": "Spoke with lead, interested in enterprise plan. Follow up next week."
  }'

{
  "ok": true,
  "data": {
    "id": 456,
    "email_lead_map_id": 2433664091,
    "note_message": "Spoke with lead, interested in enterprise plan. Follow up next week.",
    "created_at": "2025-12-01T10:30:00.000Z"
  }
}

{
  "message": "Invalid API Key"
}