[参照文档](https://wellsign-soft.oss-cn-beijing.aliyuncs.com/sdko/service/SDKO%E4%B8%8E%E6%97%A7%E7%89%88SDK2.0%E8%83%BD%E5%AF%B9%E7%85%A7%E8%A1%A8.pdf)