@abstractmethod<EOL><INDENT>def write_credentials(self, credentials=None, profile=None,<EOL>cache_token=None):<DEDENT>
pass<EOL>
Write credentials.

        Write credentials to store.

        Args:
            cache_token (bool): If ``True``, stores ``access_token`` in token store. Defaults to ``True``.
            credentials (class): Read-only credentials.
            profile (str): Credentials profile. Defaults to ``'default'``.