小程序appid 是什么？有什么用？
好比小程序的身份证号码，ID号，方便识别身份，在小程序开发，利用第三方工具，都可能要用到小程序APPID，是公开的。
怎么查找小程序的appid？比如“爱用建站”发布的小程序，进入智慧链接-点击微信小程序-基础信息-就可以查看APP ID了。
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