我在谷歌的付费应用程序中播放的今天，我想换一个免费的应用程序有3个应用内购买。问题是原因如何给予的应用程序内购买现有客户，taht已经支付的应用程序。
I have a paid app in Google Play today, that I want to change to a free app with 3 In-App purchases. The problem is of cause how to "give" the In-App purchase to existing customers, taht already paid for the app.
我刚刚有了一个想法 - 能牌做的伎俩
I just had a thought - can licensing do the trick?
现有的付费应用程序使用谷歌的许可，但是这不应该是必要的任何更多的时候所有的功能都买的应用程序内购买 - 对不对？ 因此，所有现有客户有许可证，而所有新客户不需要的。
The existing paid app uses Google licensing, but that shouldn't be necessary any more when all features are bought as In-App purchases - right? So all existing customers have a license, while all new customers don't need one.
有没有可能来检查许可证，并在情况下，它的发现补助，以相同的功能，用户接入的3应用程序内购买就可以访问？
Would it be possible to check for license, and in case it's found grant the user access to the same features as the 3 In-App purchases will give access to?
推荐答案
据我所知，目前还没有给用户的应用程序内购买免费购买时是不是已经免费的好方法（例如，通过优惠券）。
As far as I know, there is no good way to give a user an in-app purchase for free when the purchase isn't already free (eg via a coupon).
有一个在How我可以用我的应用程序的付费版本作为钥匙，以免费版本？
要做到这一点是有一些code，检查对遗留用户（那些谁安装了旧的付费应用程序），并设置了preference他们的设备上标志他们具有一种方法付费应用程序。
One way to do this would be to have some code that checks for "legacy users" (those who have the old paid app installed), and set a preference on their device that flags them as having the paid app.
如果用户切换的手机或卸载，然后重新安装你的应用程序，您会遇到问题。你可以绕过这通过添加第二组在应用程序的产品为传统的用户是免费的，但只提供给谁安装了旧的应用程序使用。他们购买免费的旧版本后，他们可以卸载旧的应用程序。然后，当你检查所购产品，您检查无论是传统的还是新产品。
You will run into problems if the user switches phones or uninstalls then reinstalls your app. You could circumvent this by adding a second set of in-app products for legacy users that are free, but are only offered to uses who have the old app installed. After they buy the free legacy versions, they could uninstall the old app. Then whenever you check for the purchased products, you check for either the legacy or the new product.
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