code: def reject_insert(self, s_pappid, order_id, reason, redirect_url=None):
          
          return self._post(
              'rejectinsert',
              data={
                  's_pappid': s_pappid,
                  'order_id': order_id,
                  'reason': reason,
                  'url': redirect_url,
              },
          )
docs: 拒绝用户的开发票请求
          详情请参考
          https://mp.weixin.qq.com/wiki?id=mp1497082828_r1cI2
  
          :param s_pappid: 开票平台在微信的标识号，商户需要找开票平台提供
          :param order_id: 订单id，在商户内单笔开票请求的唯一识别号
          :param reason: 拒绝原因
          :param redirect_url: 跳转链接