从付费到免费的W / IAP：preventing双充 [英] From Paid to FREE w/IAP: Preventing double-charging

问题描述

这是一个概念性的工作流程问题。我转换一个应用程序与现有的用户群从付费到免费与应用程序内购买（FWIAP）去除广告。我试图避免被其现有的付费用户更新应用程序，现在突然看到广告和被侮辱/使用选项再次支付以消除他们从来没有在第一时间购买了广告攻击了问题。

This is a conceptual workflow problem. I'm converting an app with an existing user base from Paid to Free with an in-app purchase (FWIAP) to remove ads. The problem I'm trying to avoid is having the existing paid customers updating the app and now suddenly seeing ads and being insulted/assaulted with the "option" to pay again to remove the ads they never bought in the first place.

幸运的是，我确实有持久性数据的形式，一些面包屑（的pData ），将显示应用程序是否已经安装。所以我的想法是决定是否与显示广告继续操作之前对现有安装新版本检查。

Luckily, I do have some breadcrumbs in the form of persistent data (pData) that will indicate whether the app was already installed. So my thought is to have the new version check for existing installs before deciding whether to proceed with displaying the ads.

一个问题我预见晚更新再综合考虑所有这些第一代的用户和现在一样的资格恢复广告，所以我必须再增加持续标志（ PFLAG ），以确定这两个组的用户，然后希望能记住甚至更晚更新（即第三代，等等）要检查的 PFLAG 不是的pData ，因为的pData 值会被那么早就改变了。

One problem I foresee is later updates then considering all those first-generation users as now eligible for ads again, so I'd have to then add another persistent flag (pFlag) to identify the two groups of users and then hope to remember for even later updates (i.e. third-gen., etc.) to check against the pFlag instead of the pData, as the pData values would have long changed by then.

这看起来像一个健全的方法，还是有另一个很好的已知的解决方案呢？

Does this seem like a sound approach or is there another good known solution to this?

推荐答案

用面包屑方案的问题是谁升级，或者得到一个替换设备，并且没有备份恢复自用户。当他们重新下载应用程序，不会有任何痕迹。

The problem with breadcrumb schemes is with users who upgrade, or have to get a replacement device, and don't have backups to restore from. When they re-download your app, there will be no breadcrumb.

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