In-app billing purchased Item List

MainActivity.java

mBillingClient.queryPurchaseHistoryAsync(SkuType.INAPP,
                                         new PurchaseHistoryResponseListener() {
    @Override
    public void onPurchaseHistoryResponse(@BillingResponse int responseCode,
                                          List<Purchase> purchasesList) {
        if (responseCode == BillingResponse.OK
                && purchasesList != null) {
            for (Purchase purchase : purchasesList) {
                // Process the result.
            }
         }
    }
});