curl -X POST "https://server.smartlead.ai/api/v1/master-inbox/untracked-replies/associate-to-lead?api_key=YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"emailCampaignId": 123, "leadMapId": 987654, "untrackedReplyId": "3f1c2d4e-5a6b-7c8d-9e0f-112233445566"}'

import requests

response = requests.post(
    "https://server.smartlead.ai/api/v1/master-inbox/untracked-replies/associate-to-lead",
    params={"api_key": "YOUR_API_KEY"},
    json={
        "emailCampaignId": 123,
        "leadMapId": 987654,
        "untrackedReplyId": "3f1c2d4e-5a6b-7c8d-9e0f-112233445566"
    }
)
print(response.json())

{
  "sucess": true,
  "message": "Untracked reply associated to lead successfully",
  "data": {
    "leadMapId": 987654,
    "swMessageId": "<abc123@mail.yourdomain.com>"
  }
}

{
  "error": "Campaign not found - Invalid emailCampaignId."
}

{
  "error": "Lead not found in campaign - Invalid leadMapId."
}

{
  "error": "Untracked reply not found - Invalid untrackedReplyId."
}

{
  "error": "No sent email found for this lead in the campaign"
}