question

Thank you for your fast response,

But I still have some related questions:

A-) How could I set the bundle itself to expire (Usage Period) after 5 seconds. Do you mean that I must set Item Bundle > Consumable > By Time > 5 seconds from the Item Bundle settings. Also why it is 5 seconds? does that mean that I must wait for 5 seconds to get new Hard Currency value?

B-) I understand that I need to use Unity IAP or similar Unity plugin to make the real transaction with GooglePlay. Is that correct?

C-) I still don't understand the exact way to make a purchase from Google Play on Unity client. Can you tell me my current estimation is correct?:

• call PlayFabClientAPI.GetCatalogItems to get the list of Items when i logged in to PlayFab (through any login method)
• from Unity IAP, call UnityPurchasing.Initialize by populating product types from PlayFab Catalog Items (I couldn't found an exact way to check if an item is purchasable by RM or not, but i could check it by looking item class)
• from Unity IAP, call IStoreController.InitiatePurchase(productId)
• from the returning result from Uniy IAP, I take the receipt and signature
• call PlayFabClientAPI.ValidateGooglePlayPurchase with the receipt and signature to validate items and add item to player inventory.

D-) And I estimate that purchising process of a basic Item (with a virtual currency price) would be like this?

• call PlayFabClientAPI.GetCatalogItems to get the list of Items when i logged in to PlayFab (through any login method)
• call PlayFabClientAPI.PurchaseItem to purchase item with specific Id from the catalog.
• then later, call PlayFabClientAPI.ConsumeItem to consume item if it is consumable.

Is there anything else?

E-) Why Price parameter of a PurchaseItemRequest is int and  CatalogItem.VirtualCurrencyPrices[currencyCode] is an uint, so I need to convert uint to int? Because my purchase code is like this:

public void PurchaseItem(string itemId, CurrencyType currencyType)
    {
        CatalogItem item = FindItem(itemId);
        if (item != null)
        {
            PurchaseItemRequest request = new PurchaseItemRequest()
            {
                ItemId = item.ItemId,
                VirtualCurrency = currencyType.ToString(),
                Price = (int)item.VirtualCurrencyPrices[currencyType.ToString()],
            };

            PlayFabClientAPI.PurchaseItem(request, (result) =>
            {
                OnResult(ResultSource.PurchaseItem, ResultType.Successed);
            }, (error) =>
            {
                Debug.Log("Got error while purchasing item " + itemId);
                OnResult(ResultSource.PurchaseItem, ResultType.Error);
            });
        }
    }

Answers to your new questions:

> A-) How could I set the bundle itself to expire (Usage Period) after 5 seconds. Do you mean that I must set Item Bundle > Consumable > By Time > 5 seconds from the Item Bundle settings.

Yes

> Also why it is 5 seconds?

While it's extremely unlikely, setting it to 1 second could result in the bundle expiring before delivering the VC. It's an extreme corner case, but I like to be 100% certain. A 5 second buffer is more than enough to be sure.

> does that mean that I must wait for 5 seconds to get new Hard Currency value?

No, the VC will be added immediately. When you get the response from the call, you'll see the new balance.

> B-) I understand that I need to use Unity IAP or similar Unity plugin to make the real transaction with GooglePlay. Is that correct?

You need to be able to get the receipt from Google. Many titles use a plugin for this, and yes, Unity IAP gives you the receipt.

> C-) I still don't understand the exact way to make a purchase from Google Play on Unity client. Can you tell me my current estimation is correct?:

We have a walkthrough for this, using Google's In-app billing service, here: https://playfab.com/show-me-money-receipt-validation-ios-and-android/

If you choose to use a plugin, the details of how you call to initiate the purchase with Google (and so, how you get the receipt) will vary, and you should check the plugin's docs for specifics. They keys are that the catalog in PlayFab gives you prices you can show to the players as a base, but the real price for the item lives in Google - they just don't provide an accessor which would allow us to use the current pricing from their service.

> D-) And I estimate that purchising process of a basic Item (with a virtual currency price) would be like this?

Yes, purchases which are just for Virtual Currency would use PurchaseItem. The ConsumeItem call is only needed if you intend to decrement the uses remaining, like with a potion or similar - something the player can use up. If you just want it to expire shortly after arriving in the inventory (like the bundle), you can use the Usage Period.

> E-) Why Price parameter of a PurchaseItemRequest is int and  CatalogItem.VirtualCurrencyPrices[currencyCode] is an uint, so I need to convert uint to int? Because my purchase code is like this:

That's a legacy issue which the tools team is looking to fix in a future update.

Really thanks. It was enlightening!

Google Play in-app purchase has the same mechanism as Apple Store in-app purchase, which is the purchase with receipt validation. In terms of Google platform, you may refer to the documentation on: https://docs.microsoft.com/en-us/gaming/playfab/features/commerce/economy/getting-started-with-unity-iap-android.

In addition, we also provide a tutorial for iOS in-app purchase on: https://blog.playfab.com//blog/show-me-money-receipt-validation-ios-and-android/.