[SOLVED] Error validating purchase receipt with PlayFab and Unity3D

In my Unity mobile/android game I am using Google Play IAP, and then need to validate the purchase with PlayFab.

I can successfully make the purchase but when validating with PlayFab I get an error that the receipt I send is invalid. I have attached my logs of the receipt data I am sending along with the error, and the code.

Any help on this would be hugely appreciated.

CODE

[System.Serializable]
public class ReceiptWrapper
{
    public string Store;
    public string Payload;
}

[System.Serializable]
public class GooglePayloadWrapper
{
    public string json;
    public string signature;
}

public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs args)
{
    int pearlAmount = GetPearlAmount(args.purchasedProduct.definition.id);
    
    Debug.Log($"JHL: Processing purchase for product: {args.purchasedProduct.definition.id}");
    Debug.Log($"JHL: Raw receipt: {args.purchasedProduct.receipt}");
    
    try 
    {
        // Parse the outer receipt wrapper
        var wrapper = JsonUtility.FromJson<ReceiptWrapper>(args.purchasedProduct.receipt);
        Debug.Log($"JHL: Store: {wrapper.Store}");
        Debug.Log($"JHL: Payload: {wrapper.Payload}");

        if (Application.platform == RuntimePlatform.Android)
        {
            // Parse the Google Play specific payload
            var gpDetails = JsonUtility.FromJson<GooglePayloadWrapper>(wrapper.Payload);
            Debug.Log($"JHL: Google JSON: {gpDetails.json}");
            Debug.Log($"JHL: Google Signature: {gpDetails.signature}");

            // The json field is already a JSON string, don't parse it again
            var request = new ValidateGooglePlayPurchaseRequest
            {
                ReceiptJson = gpDetails.json,
                Signature = gpDetails.signature,
                CurrencyCode = args.purchasedProduct.metadata.isoCurrencyCode,
                PurchasePrice = (uint)(args.purchasedProduct.metadata.localizedPrice * 100)
            };

            // Log the complete request for debugging
            Debug.Log($"JHL: Complete request being sent to PlayFab:");
            Debug.Log($"JHL: ReceiptJson: {request.ReceiptJson}");
            Debug.Log($"JHL: Signature: {request.Signature}");
            Debug.Log($"JHL: CurrencyCode: {request.CurrencyCode}");
            Debug.Log($"JHL: PurchasePrice: {request.PurchasePrice}");

            PlayFabClientAPI.ValidateGooglePlayPurchase(request,
                result => {
                    Debug.Log($"JHL: Purchase validation successful!");
                    Player.Instance.AddPearls(pearlAmount);
                    UIFunctions.Instance.ShowMessage($"Purchase successful!\nAdded {pearlAmount} pearls");
                },
                error => {
                    Debug.LogError($"JHL: Failed to validate purchase: {error.ErrorMessage}");
                    Debug.LogError($"JHL: Error details: {JsonUtility.ToJson(error)}");
                    Debug.LogError($"JHL: HTTP code: {error.HttpCode}");
                    Debug.LogError($"JHL: Error code: {error.Error}");
                    UIFunctions.Instance.ShowMessage("Purchase validation failed.\nPlease contact support.");
                });
        }
    }
    catch (System.Exception e)
    {
        Debug.LogError($"JHL: Exception while processing receipt: {e}");
        Debug.LogError($"JHL: Stack trace: {e.StackTrace}");
    }

    return PurchaseProcessingResult.Complete;
}

LOGS

Info Unity JHL: Processing purchase for product: com.pixelfish.pearl100 Info Unity IAPManager:ProcessPurchase(PurchaseEventArgs) Info Unity UnityEngine.Purchasing.PurchasingManager:ProcessPurchaseIfNew(Product) Info Unity UnityEngine.Purchasing.Extension.UnityUtil:Update() Info Unity Info Unity JHL: Final Receipt JSON being sent: {"orderId":"GPA.3396-9471-9799-74081","packageName":"com.PufferfishStudios.PixelFish","productId":"com.pixelfish.pearl100","purchaseTime":1743075692104,"purchaseState":0,"purchaseToken":"doeklojbfffbgphcipbmflaa.AO-J1OzClvRrlk2HoHz343vYDytID4Cxjx2axF-r9-VcNgCIKtEk5q3gBqatb9DUQPubVGeAYT9dGgxSfJMLYwVCKw8QX2_Lw_3q4PVTRlutjLP0yoLcL8A","quantity":1,"acknowledged":false} Info Unity IAPManager:ProcessPurchase(PurchaseEventArgs) Info Unity UnityEngine.Purchasing.PurchasingManager:ProcessPurchaseIfNew(Product) Info Unity UnityEngine.Purchasing.Extension.UnityUtil:Update() Info Unity Info Unity JHL: Final Signature being sent: jEBe5C6yXZfN/Ro36+FwtOeXFkhQcTvEHE7/TlJZkOVGfZxT6FKTNXrWqBG0f6Omi5+xz03RUoSN6rnQimM6ANCRe3IKwYfgRA9PkFUGjZ0Eo2c/5yRTlNLmuyEro9VkT/L7VOwl9Vxcvkg7/uQr+6SsAUhSJ7cd5cyKnX8DxvsgZN02zBa9ajOm/JzhyuMJDlNEmQ5YbtGpjxGj8hFiSy/yBrMskkkhSY+MCbUhU/yAvDcT0bOx/NCzqud7Nt5odkbZqKQ8OsPRRh/2sbXJ21oeRde2pASceQqHdeUhRe+O+MuAyWHwxdXmqUFpsDdYsxvudycLLqI9oXnX5Yyg6g== Info Unity IAPManager:ProcessPurchase(PurchaseEventArgs) Info Unity UnityEngine.Purchasing.PurchasingManager:ProcessPurchaseIfNew(Product) Info Unity UnityEngine.Purchasing.Extension.UnityUtil:Update() Info Unity Info Unity JHL: Final Currency: GBP Info Unity IAPManager:ProcessPurchase(PurchaseEventArgs) Info Unity UnityEngine.Purchasing.PurchasingManager:ProcessPurchaseIfNew(Product) Info Unity UnityEngine.Purchasing.Extension.UnityUtil:Update() Info Unity Info Unity JHL: Final Price: 99 Info Unity IAPManager:ProcessPurchase(PurchaseEventArgs) Info Unity UnityEngine.Purchasing.PurchasingManager:ProcessPurchaseIfNew(Product) Info Unity UnityEngine.Purchasing.Extension.UnityUtil:Update() Info Unity Error Unity JHL: Failed to validate purchase: Invalid receipt Error Unity <>c:b__18_1(PlayFabError) Error Unity PlayFab.Internal.PlayFabUnityHttp:OnResponse(String, CallRequestContainer) Error Unity PlayFab.Internal.d__12:MoveNext() Error Unity UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr) Error Unity Error Unity JHL: Error details: {"ApiEndpoint":"/Client/ValidateGooglePlayPurchase","HttpCode":400,"HttpStatus":"BadRequest","Error":1021,"ErrorMessage":"Invalid receipt"} Error Unity <>c:b__18_1(PlayFabError) Error Unity PlayFab.Internal.PlayFabUnityHttp:OnResponse(String, CallRequestContainer) Error Unity PlayFab.Internal.d__12:MoveNext() Error Unity UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr) Error Unity Error Unity JHL: HTTP code: 400 Error Unity <>c:b__18_1(PlayFabError) Error Unity PlayFab.Internal.PlayFabUnityHttp:OnResponse(String, CallRequestContainer) Error Unity PlayFab.Internal.d__12:MoveNext() Error Unity UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr) Error Unity Error Unity JHL: Error code: InvalidReceipt Error Unity <>c:b__18_1(PlayFabError) Error Unity PlayFab.Internal.PlayFabUnityHttp:OnResponse(String, CallRequestContainer) Error Unity PlayFab.Internal.d__12:MoveNext() Error Unity UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr) Error Unity