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