Google Play Billing Library 3.0+ - Restore purchase

Question

With Google Play Billing Library v3.0+ we have a new purchase flow and everything is perfectly explained here: Google Play Billing

On older versions of the library we would restore something like this:

bp = new BillingProcessor(this, MERCHANT_ID, new BillingProcessor.IBillingHandler() {
        @Override
        public void onProductPurchased(@NonNull String productId, @Nullable TransactionDetails details) {
            String orderId = details.purchaseInfo.purchaseData.productId;
  // we then compare the orderID with the SKU and see if the user purchased the item,
  // however in the new version of the library there is nothing about restore

However, there is nothing in the documentation about restoring purchases?

Eg, we have a use case you have a valid subscription and one IAP product that you purchased. You delete the app and reinstall it. How do you restore the subscription and that IAP product?

Answer 1

BillingProcessor and onProductPurchased seemed not to be part of Play Billing Library (nor AIDL), it's more like a wrap class implemented by anjlab( https://github.com/anjlab/android-inapp-billing-v3 ) To fullfill your needs, I think queryPurchases and queryPurchaseHistoryAsync can help.

Answer 2

Basically queryPurchaseHistoryAsync does the job, just be careful to pass the SKU TYPE (inapp or subs).

My implementation:

fun restorePurchaseInApp() {
    bp.queryPurchaseHistoryAsync("inapp", this)
}

fun restorePurchaseInSubs() {
    bp.queryPurchaseHistoryAsync("subs", this)
}

// bp is BillingClient
// the class should implement PurchaseHistoryResponseListener

override fun onPurchaseHistoryResponse(
    p0: BillingResult,
    p1: MutableList<PurchaseHistoryRecord>?
) {
    if (p1 != null) {
        Log.d("TMS", "onPurchaseHistoryResponse: " + p1.size)
    }

    if (p1 != null) {
        for (item in p1) {
            Log.d("TMS", "onPurchaseHistoryResponse sku: " + item.sku)
            Log.d("TMS", "onPurchaseHistoryResponse signature: " + item.signature)
            Log.d("TMS", "onPurchaseHistoryResponse purchaseToken: " + item.purchaseToken)
            Log.d("TMS", "onPurchaseHistoryResponse purchaseTime: " + item.purchaseTime)
        }
    }
}

There you get the items that are purchased and that`s it:). I hope this will help because I lost a lot of time figuring out something so simple and the docs implementation have no mention about this.