@classmethod
def get_business_required_fields(cls):
    """
        Get ``set`` of ``required fields`` for :attr:`.BUSINESS_TYPE`

        Returns:
            ``set` `of fields
        """
    fields = cls.get_required_fields()
    return fields.union(super().get_business_required_fields(), {
        'business_name', 'business_phone', 'business_email',
        'business_website', 'business_opening_date', 'owner',
        'business_address'})
