curl --request POST \
  --url https://api.staging.kathan.tech/chat \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-User-ID: <api-key>' \
  --data '
{
  "assistant_id": "<string>",
  "input": "",
  "session_id": "<string>"
}
'

{
  "output_type": "<string>",
  "output": "<string>",
  "session_id": "<string>",
  "token_usage": {}
}