文档链接地址404
https://developers.weixin.qq.com/doc/oplatform/Third-party_Platforms/2.0/api/Before_Develop/Authorization_Process_Technical_Description.html中描述的说全步骤中，步骤一给的链接【接口详情请查看api_create_preauthcode】，点击后404
步骤一、调用接口获取预授权码（pre_auth_code），接口详情请查看api_create_preauthcode
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