code: def all(cls, **kwargs):
          
          url = recurly.base_uri() + cls.collection_path
          if kwargs:
              url = '%s?%s' % (url, urlencode_params(kwargs))
          return Page.page_for_url(url)
docs: Return a `Page` of instances of this `Resource` class from
          its general collection endpoint.
  
          Only `Resource` classes with specified `collection_path`
          endpoints can be requested with this method. Any provided
          keyword arguments are passed to the API endpoint as query
          parameters.