curl --request POST \
  --url https://api.osvi.ai/chat_messages/send_message \
  --header 'API-Token: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agent_uuid": "agent_IsZ3Q6Sf_60Eh26XQMGbz-R_og",
  "chat_session_id": "4718a326-417b-4dda-90d0-21fd65a11cb8",
  "message": "What are your business hours?"
}
'

{
  "success": true,
  "data": {
    "session_id": "4718a326-417b-4dda-90d0-21fd65a11cb8",
    "response": "We're open Monday to Friday, 9 AM to 6 PM IST.",
    "tool_calls": [
      "<unknown>"
    ],
    "tool_results": [
      "<unknown>"
    ],
    "current_state": null
  }
}