def __init__(self, name, code, url_namespace='anysign', **kwargs):
        """Configure backend."""
        #: Human-readable name.
        self.name = name

        #: Machine-readable name. Should be lowercase alphanumeric only, i.e.
        #: PEP-8 compliant.
        self.code = code

        #: Namespace for URL resolution.
        self.url_namespace = url_namespace