App调用微信登录，AppSecret放哪？

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In the past, there were only small programs in the product. Now we need to develop an app and log in via wechat. After reading the official documents, all the interactions are between the app and the wechat server, without the participation of its own back-end. Before the development of the applet, the applet value provides a code, and all interactions are back-end and wechat server. How can app interact with wechat directly on the app side? Even access_ The token is also obtained by the app itself, which will not cause access on multiple devices_ Does token conflict? Or access for app login_ Token and access of small program_ Different token can only be used on the current app? In addition, will there be no security problems with appsecret?

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