def METHOD_NAME(self, domain, default_data=None):
    '''
    :param domain:
    :type domain: str
    :param default_data: optional
    :type default_data: dict
    :return:
    :rtype: dict
    '''
    if domain not in DOMAINS:
        raise WrongDomainNameException('Wrong domain name specified. "{}" is not a valid value'.format(domain))
    try:
        all_data = self.get_all_data()
    except NotificationUserExtraNotFound:
        all_data = {}
    return all_data.get(domain, default_data)