curl "https://server.smartlead.ai/api/v1/campaigns/123/leads/789/message-history?api_key=YOUR_KEY"

import requests

response = requests.get(
    f"https://server.smartlead.ai/api/v1/campaigns/123/leads/789/message-history",
    params={"api_key": "YOUR_API_KEY", "show_plain_text_response": True}
)

history = response.json()
for msg in history['messages']:
    direction = "➡️ " if msg['direction'] == 'outbound' else "⬅️ "
    print(f"{direction}{msg['subject']} - {msg['sent_at']}")

{
  "messages": [
    {
      "id": "msg_1",
      "subject": "Partnership Opportunity",
      "direction": "outbound",
      "sent_at": "2025-01-15T10:00:00Z",
      "opened_at": "2025-01-15T10:30:00Z"
    },
    {
      "id": "msg_2",
      "subject": "Re: Partnership Opportunity",
      "direction": "inbound",
      "received_at": "2025-01-20T14:00:00Z"
    }
  ]
}