docs: def empty(cls, **kwargs):
          """Empty cart.
  
          Empty the shopping cart.
          This method makes a synchronous HTTP request by default. To make an
          asynchronous HTTP request, please pass async=True
          >>> thread = api.empty(async=True)
          >>> result = thread.get()
  
          :param async bool
          :return: ShoppingCart
                   If the method is called asynchronously,
                   returns the request thread.
          """
          kwargs['_return_http_data_only'] = True
          if kwargs.get('async'):
              return cls._empty_with_http_info(**kwargs)
          else:
              (data) = cls._empty_with_http_info(**kwargs)
              return data