curl --request POST \
  --url https://api.example.com/v2/documents/{document_id}/documents/ \
  --header 'Content-Type: application/json' \
  --data '{
  "type": 0
}'

{
  "id": 123,
  "file": "<string>",
  "base64": "<string>",
  "extra": "<unknown>",
  "type": 0
}