Async Fetch

curl --request POST \
  --url https://public-api.cambio-ai.com/async/fetch \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "file_id": "<string>"
}'

{
  "markdown": {},
  "pageCount": 123
}