https://developers.weixin.qq.com/doc/oplatform/Third-party_Platforms/2.0/api/Before_Develop/Authorization_Process_Technical_Description.html#%E4%BA%8C%E3%80%81%E6%8E%88%E6%9D%83%E9%93%BE%E6%8E%A5%E6%9E%84%E5%BB%BA%E7%9A%84%E6%96%B9%E6%B3%95