code: def do_require(version, service)
        filename = [api_path, version.to_s, service.to_s.snakecase].join('/')
        require filename
        return filename
      end
docs: Perform the loading of the necessary source files for a version.
  
   Args:
   - version: the API version
   - service: service name
  
   Returns:
   The filename that was loaded