面向应用开发者的退款机制、商店政策变化和收入防护策略。
只要你的服务器在三天内没有确认某笔购买，Google Play 就会自动退款并撤销这笔购买。这是集成失误，不是客户的决定，而且完全可以避免。下面讲清楚具体规则、它为什么会触发，以及每一笔流失的销售真正的代价。
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一次又一次申请退款的客户并非偶然。退款滥用不仅让你退回金额，还要搭上你已经花掉的算力，而两大商店都会给你一个身份信号，即 Apple 的 appAccountToken 和 Google 的混淆账户 ID，用来把这种模式串联起来。
Apple 和 Google 都可能在退款完成后，仍让客户保留其购买内容。以下是访问权限何时会自动移除，何时需要由你的服务器来处理，以及大多数集成从未处理过的那一个通知。
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