def setup_cmd_parser(cls):
        """Returns the Groupsio argument parser."""

        parser = BackendCommandArgumentParser(cls.BACKEND.CATEGORIES,
                                              from_date=True,
                                              token_auth=True)

        # Backend token is required
        action = parser.parser._option_string_actions['--api-token']
        action.required = True

        # Optional arguments
        group = parser.parser.add_argument_group('Groupsio arguments')
        group.add_argument('--mboxes-path', dest='mboxes_path',
                           help="Path where mbox files will be stored")
        group.add_argument('--no-verify', dest='verify',
                           action='store_false',
                           help="Value 'True' enable SSL verification")

        # Required arguments
        parser.parser.add_argument('group_name',
                                   help="Name of the group on Groups.io")

        return parser
Returns the Groupsio argument parser.