curl --request POST \
  --url https://api.example.com/api/v1/files/{file_uuid}/permissions \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "expires_at": "<string>",
  "permission": "<string>",
  "principal_id": "<string>",
  "principal_type": "<string>"
}
'

{
  "created_at": "<string>",
  "expires_at": "<string>",
  "granted_by": "<string>",
  "id": "<string>",
  "permission": "<string>",
  "principal_id": "<string>",
  "principal_type": "<string>"
}