val client: BillingClient = ...
val acknowledgePurchaseResponseListener: AcknowledgePurchaseResponseListener = ...

suspend fun handlePurchase() {
    if (purchase.purchaseState === PurchaseState.PURCHASED) {
        if (!purchase.isAcknowledged) {
            val acknowledgePurchaseParams = AcknowledgePurchaseParams.newBuilder()
                    .setPurchaseToken(purchase.purchaseToken)
            val ackPurchaseResult = withContext(Dispatchers.IO) {
               client.acknowledgePurchase(acknowledgePurchaseParams.build())
            }
        }
     }
}