为什么在 Google Play 中购买的应用内商品会自动退款？

Question

将应用计费库更新为实现 'com.android.billingclient:billing:2.0.1' 后，即使 3 天后我也开始看到退款。这怎么可能？谷歌在这里只提到如果用户在购买后短时间内卸载应用程序，则购买退款。我想3天不是很短的时间。

Answer 1

用户必须在 3 天内确认购买，否则订阅将被退还：

https://developer.android.com/google/play/billing/billing_library_overview#acknowledge

Answer 2

在PurchasesUpdatedListener中执行以下操作

private val purchaseUpdateListener = PurchasesUpdatedListener { billingResult, purchases ->
for (purchase in purchases) {
    if (purchase.purchaseState == Purchase.PurchaseState.PURCHASED) {
        if (!purchase.isAcknowledged) {
                 val acknowledgePurchaseParams = 
                     AcknowledgePurchaseParams.newBuilder()
                     .setPurchaseToken(purchase.purchaseToken).build()

                 billingClient?.acknowledgePurchase(acknowledgePurchaseParams) { 
                     billingResult ->
                         val billingResponseCode = billingResult.responseCode
                         val billingDebugMessage = billingResult.debugMessage

                         Log.v("TAG_INAPP", "response code: $billingResponseCode")
                         Log.v("TAG_INAPP", "debugMessage : $billingDebugMessage")
                        }
         }
 }

此代码将向 Google 服务器发送购买确认信息。因此，通过您的应用进行的任何购买都将不再无效，也不会自动退款。