def order_items(self, *args, **kwargs):
try:<EOL><INDENT>self._get_provider_session('<STR_LIT>').order_items(*args, **kwargs)<EOL><DEDENT>except InvalidArgument:<EOL><INDENT>self._get_sub_package_provider_session(<EOL>'<STR_LIT>', '<STR_LIT>').order_items(*args, **kwargs)<EOL><DEDENT>
Pass through to provider methods.