def doFeedback(self, item_id, use_comment_template, buyer_id, comment, comment_type, op):
        """http://allegro.pl/webapi/documentation.php/show/id,42"""
        return self.__ask__('doFeedback',
                            feItemId=item_id,
                            feUseCommentTemplate=use_comment_template,
                            feToUserId=buyer_id,
                            feComment=comment,
                            feCommentType=comment_type,
                            feOp=op)['feedbackId']