已经弹出授权页面了，并且拿到code了 ，怎么请求换取 openid呢？ 授权回调地址是跳去后端，还是前端 ？？
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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
前端获取到code，给后端获取openId。但是openId是不需要返回给前端的，前端没用的，而且官方不建议将这种私密数据暴露在前端