Null receipt but valid purchase [Android]

Hi there,

we are having an issue with some payments successfully completing while Unity IAP returns a null receipts with PurchaseFailureReason.Unknown.

We are able to reproduce it (while not often, it's very hard) with the following procedure:

1. Start purchase
2. Go though google play checkout
3. Disconnect the phone just before google processes the payment, it yields a success
4. Unity generates the aforementioned error

Even if we restart the phone the purchase is gone and is not recoverable, is there a way to force a restore?

When this happens we get the following error:

2020-03-17 10:22:01.072 30305-30305/? I/UnityIAP: onActivityResult

2020-03-17 10:22:01.072 30305-30305/? I/UnityIAP: Purchase data: null

2020-03-17 10:22:01.072 30305-30305/? I/UnityIAP: Data signature: null

2020-03-17 10:22:01.072 30305-30305/? I/UnityIAP: Purchase canceled - Response: 2:Unknown

2020-03-17 10:22:01.073 30305-30305/? I/UnityIAP: onIabPurchaseFinished: false

2020-03-17 10:22:01.073 30305-30305/? I/UnityIAP: 2:Unknown (response: 2:Unknown)

2020-03-17 10:22:01.073 30305-30305/? I/UnityIAP: Purchase response code:2

2020-03-17 10:22:01.119 1318-9294/? E/ActivityTrigger: activityResumeTrigger: not whiteListedcom.mola.playspace.android.bingo/com.playspace.common.PSUnityActivity/662

2020-03-17 10:22:01.120 1318-9294/? E/ActivityTrigger: activityResumeTrigger: not whiteListedcom.mola.playspace.android.bingo/com.playspace.common.PSUnityActivity/662

2020-03-17 10:22:01.231 30305-30374/? I/Unity: onPurchaseFailedEvent({0}): com.playspace.bingo.coins_pack_a_1_2

    UnityEngine.Purchasing.PurchasingManager:OnPurchaseFailed(PurchaseFailureDescription)

    UnityEngine.Purchasing.JSONStore:OnPurchaseFailed(PurchaseFailureDescription, String)

    System.Action:Invoke()

    UnityEngine.Purchasing.Extension.UnityUtil:Update()    (Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 48)

Thanks in advanced.

Kind regards

 

Yes we can see the transactionID in our google play console, that was the way to award the user with the reward from our backend.

I will ask QA to clear the cache but that is not a very good solution to tell our users. Is there a way to restore purchases in that case so could verify them again with our backend? Having a list of all purchases from GPlay would be enough to check on our backend the state of each of them.

 

For now we got some user feedback plus a direct contact button with our customer support to resolve any missing cases.