curl --request POST \
  --url https://api.faces.sh/v1/compile/threads/{thread_id}/messages \
  --header 'Content-Type: application/json' \
  --data '
{
  "message": "<string>",
  "interviewer_billing_source": "<string>"
}
'

{
  "thread_id": "<string>",
  "label": "<string>",
  "alias": "<string>",
  "status": "<string>",
  "message": {
    "role": "<string>",
    "content": "<string>",
    "name": "<string>"
  },
  "tokens_used": 123,
  "tokens_limit": 123,
  "tokens_charged": 0,
  "interviewer_billing_source": "<string>"
}