为什么在Google Play购买应用内商品会自动退款？

Question

将应用程序计费库更新为 实现'com.android.billingclient：billing：2.0.1' 即使三天后，我也开始看到退款。那怎么可能？ Google仅提及here，如果用户在购买后不久就卸载了该应用程序，则该购买款项将被退还。我想3天不是短时间。

Answer 1

用户必须在3天内确认购买，否则订阅将被退款：

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")
                        }
         }
 }