说明写 由接入方通过 productId，deviceId，privateKey 经过运算后得到的签名
这个运算是什么？
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官方有工具可生成 signature
https://developers.weixin.qq.com/doc/oplatform/Miniprogram_Frame/utils.html#_3-%E7%94%9F%E6%88%90%E7%A1%AC%E4%BB%B6%E7%AD%BE%E5%90%8D