code: def service(name, version = nil)
        name = name.to_sym
        version = (version.nil?) ? api_config.default_version : version.to_sym
  
        # Check if the combination is available.
        validate_service_request(version, name)
  
        # Try to re-use the service for this version if it was requested before.
        wrapper = if @wrappers.include?(version) && @wrappers[version][name]
          @wrappers[version][name]
        else
          @wrappers[version] ||= {}
          @wrappers[version][name] = prepare_wrapper(version, name)
        end
        return wrapper
      end
docs: Obtain an API service, given a version and its name.
  
   Args:
   - name: name for the intended service
   - version: intended API version.
  
   Returns:
   - the service wrapper for the intended service.