Download a file.
- The ID of the file to be retrieved. It typically follows the format
f-###-####, but is not guaranteed to do so, and should be treated as an opaque string.
HTTP/1.1 200 OK
- 403 missing_scope
- In order to download files from orders, you need the orders.read scope.
- 404 not_found
- The file you requested doesn't exist.