def save(self):
        """Method that saves configuration parameter changes from instance of SHConfig class to global config class and
        to `config.json` file.

        Example of use case
            ``my_config = SHConfig()`` \n
            ``my_config.instance_id = '<new instance id>'`` \n
            ``my_config.save()``
        """
        is_changed = False
        for prop in self._instance.CONFIG_PARAMS:
            if getattr(self, prop) != getattr(self._instance, prop):
                is_changed = True
                setattr(self._instance, prop, getattr(self, prop))
        if is_changed:
            self._instance.save_configuration()