在获取授权code未被使用的前提下，调用授权接口https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=APPSECRET&code=CODE&grant_type=authorization_code，提示errcode:40163,errmsg:code been used,是偶现的
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- Raw code: Mini Program/Development/Capabilities/Industry capability/Ride Code/Raw code
- 3、 sample code: Mini Program/Development/Capabilities/Industry capability/Ride Code/Raw code
- 3、 sample code: Mini Program/Development/Capabilities/Industry capability/Ride Code/Scan Code Payment
- Scan Code Payment: Mini Program/Development/Capabilities/Industry capability/Ride Code/Scan Code Payment
- Return code: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Get and verify QR code interface/Generate QR code
https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html，看下了文档，确实没有找到关于code的更详细的说明，个人建议，找你们前端同学，使用开发者工具调试一下，看下auth认证回跳返回的code，即可验证你的问题