화웨이 로그인 시스템 추가중

Config/DefaultEngine.ini

@@ -145,8 +145,10 @@ KeyAlias=rmvw2021
 KeyStorePassword=3df1q2w3e
 KeyPassword=3df1q2w3e
 ApplicationDisplayName=Real Madrid Virtual World
-bBuildForArmV7=False
-bBuildForArm64=True
+bBuildForArmV7=True
+bBuildForArm64=False
+MinSDKVersion=26
+TargetSDKVersion=30
 
 [/Script/GooglePADEditor.GooglePADRuntimeSettings]
 bOnlyDistribution=False

Huawei.uproject

@@ -33,6 +33,11 @@
 				"Linux",
 				"Mac"
 			]
+		},
+		{
+			"Name": "AndroidPlayBilling",
+			"Enabled": true,
+			"MarketplaceURL": "com.epicgames.launcher://ue/marketplace/product/ad0040f7dbbc45cebdcbc4b2c5982904"
 		}
 	]
 }
\ No newline at end of file

Plugins/AndroidPlayBilling/AndroidPlayBilling.uplugin

+{
+	"FileVersion": 3,
+	"Version": 1,
+	"VersionName": "1.0",
+	"FriendlyName": "Android Play Billing",
+	"Description": "Android Play Billing plugin for Unreal Engine provides Google Play Billing methods for buying consumable, non-consumable products and subscriptions.",
+	"Category": "Android",
+	"CreatedBy": "Nikita Klimov",
+	"CreatedByURL": "https://github.com/kulichin",
+	"DocsURL": "https://github.com/kulichin/UnrealAndroidPlayBilling/wiki",
+	"MarketplaceURL": "com.epicgames.launcher://ue/marketplace/product/ad0040f7dbbc45cebdcbc4b2c5982904",
+	"SupportURL": "https://github.com/kulichin/UnrealAndroidPlayBilling/issues",
+	"EngineVersion": "4.25.0",
+	"CanContainContent": false,
+	"IsBetaVersion": true,
+	"Installed": true,
+	"Modules": [
+		{
+			"Name": "AndroidPlayBilling",
+			"Type": "Runtime",
+			"LoadingPhase": "Default",
+			"WhitelistPlatforms": [
+				"Win64",
+				"Mac",
+				"Android"
+			]
+		}
+	]
+}
\ No newline at end of file

Plugins/AndroidPlayBilling/Source/.clang-format

+---
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+FixNamespaceComments: true
+ForEachMacros:
+  - for
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+IncludeCategories:
+  - Regex:           '.*\.generated\.h'
+    Priority:        100
+  - Regex:           '.*(PCH).*'
+    Priority:        -1
+  - Regex:           '".*"'
+    Priority:        1
+  - Regex:           '^<.*\.(h)>'
+    Priority:        3
+  - Regex:           '^<.*>'
+    Priority:        4
+IncludeIsMainRegex: '([-_](test|unittest))?$'
+IndentCaseLabels: true
+IndentPPDirectives: None
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
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+ObjCBinPackProtocolList: Never
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+    Delimiters:
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+      - 'c++'
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+    BasedOnStyle:    google
+  - Language:        TextProto
+    Delimiters:
+      - pb
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+    EnclosingFunctions:
+      - EqualsProto
+      - EquivToProto
+      - PARSE_PARTIAL_TEXT_PROTO
+      - PARSE_TEST_PROTO
+      - PARSE_TEXT_PROTO
+      - ParseTextOrDie
+      - ParseTextProtoOrDie
+    CanonicalDelimiter: ''
+ReflowComments:  true
+SortIncludes:    true
+SortUsingDeclarations: true
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+SpacesInAngles:  false
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+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Auto
+TabWidth:        4
+UseTab:          Always
+...

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/Android/AndroidPlayBilling.java

+// Copyright (C) 2021. Nikita Klimov. All rights reserved.
+
+package com.kulichin.androidplaybilling;
+
+import android.app.Activity;
+
+import androidx.annotation.NonNull;
+
+import com.android.billingclient.api.AccountIdentifiers;
+import com.android.billingclient.api.AcknowledgePurchaseParams;
+import com.android.billingclient.api.BillingClient;
+import com.android.billingclient.api.BillingClientStateListener;
+import com.android.billingclient.api.BillingFlowParams;
+import com.android.billingclient.api.BillingResult;
+import com.android.billingclient.api.ConsumeParams;
+import com.android.billingclient.api.PriceChangeFlowParams;
+import com.android.billingclient.api.Purchase;
+import com.android.billingclient.api.PurchaseHistoryRecord;
+import com.android.billingclient.api.PurchasesUpdatedListener;
+import com.android.billingclient.api.SkuDetails;
+import com.android.billingclient.api.SkuDetailsParams;
+import com.android.billingclient.api.SkuDetailsResponseListener;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+
+public class AndroidPlayBilling
+{
+    public static native void NativeCompleteOperation(int ResponseCode, String ResponseMessage);
+    public static native void NativeCompleteLaunchBillingFlow(
+        int ResponseCode,
+        String ResponseMessage,
+        PurchaseRecord[] Array,
+        int ArraySize);
+
+    public static native void NativeCompleteQueryPurchaseHistory(
+        int ResponseCode,
+        String ResponseMessage,
+        PurchaseRecordFromHistory[] Array,
+		int ArraySize);
+
+    public static native void NativeCompleteQuerySkuDetails(
+        int ResponseCode,
+        String ResponseMessage,
+        SkuDetailsRecord[] Array,
+		int ArraySize);
+
+    public static native void NativeCompleteQueryPurchases(
+        int ResponseCode,
+        String ResponseMessage,
+        PurchaseRecord[] Array,
+		int ArraySize);
+
+	public static native void NativeInitialize(
+		Class SkuDetailsRecordClass,
+		Class PurchaseRecordFromHistoryClass,
+		Class PurchaseRecordClass
+	);
+
+    public static class SkuDetailsRecord
+    {
+        public String OriginalJSON;
+        public String ProductID;
+        public String Type;
+        public String Price;
+        public long PriceAmountMicros;
+        public String PriceCurrencyCode;
+        public String OriginalPrice;
+        public long OriginalPriceAmountMicros;
+        public String Title;
+        public String Description;
+        public String SubscriptionPeriod;
+        public String FreeTrialPeriod;
+        public String IntroductoryPrice;
+        public long IntroductoryPriceAmountMicros;
+        public String IntroductoryPricePeriod;
+        public int IntroductoryPriceCycles;
+        public String IconURL;
+
+        SkuDetailsRecord(
+            String OriginalJSON,
+            String ProductID,
+            String Type,
+            String Price,
+            long PriceAmountMicros,
+            String PriceCurrencyCode,
+            String OriginalPrice,
+            long OriginalPriceAmountMicros,
+            String Title,
+            String Description,
+            String SubscriptionPeriod,
+            String FreeTrialPeriod,
+            String IntroductoryPrice,
+            long IntroductoryPriceAmountMicros,
+            String IntroductoryPricePeriod,
+            int IntroductoryPriceCycles,
+            String IconURL
+        )
+        {
+            this.OriginalJSON = OriginalJSON;
+            this.ProductID = ProductID;
+            this.Type = Type;
+            this.Price = Price;
+            this.PriceAmountMicros = PriceAmountMicros;
+            this.PriceCurrencyCode = PriceCurrencyCode;
+            this.OriginalPrice = OriginalPrice;
+            this.OriginalPriceAmountMicros = OriginalPriceAmountMicros;
+            this.Title = Title;
+            this.Description = Description;
+            this.SubscriptionPeriod = SubscriptionPeriod;
+            this.FreeTrialPeriod = FreeTrialPeriod;
+            this.IntroductoryPrice = IntroductoryPrice;
+            this.IntroductoryPriceAmountMicros = IntroductoryPriceAmountMicros;
+            this.IntroductoryPricePeriod = IntroductoryPricePeriod;
+            this.IntroductoryPriceCycles = IntroductoryPriceCycles;
+            this.IconURL = IconURL;
+        }
+    }
+
+    public static class PurchaseRecordFromHistory
+    {
+        public String ProductID;
+        public long PurchaseTime;
+        public String PurchaseToken;
+        public String DeveloperPayload;
+        public String OriginalJSON;
+        public String Signature;
+
+        PurchaseRecordFromHistory(
+            String ProductID,
+            long PurchaseTime,
+            String PurchaseToken,
+            String DeveloperPayload,
+            String OriginalJSON,
+            String Signature
+        )
+        {
+            this.ProductID = ProductID;
+            this.PurchaseTime = PurchaseTime;
+            this.PurchaseToken = PurchaseToken;
+            this.DeveloperPayload = DeveloperPayload;
+            this.OriginalJSON = OriginalJSON;
+            this.Signature = Signature;
+        }
+    }
+
+    public static class PurchaseRecord
+    {
+        public String OrderID;
+        public String PackageName;
+        public String ProductID;
+        public long PurchaseTime;
+        public String PurchaseToken;
+        public int PurchaseState;
+        public String DeveloperPayload;
+        public boolean bAcknowledged;
+        public boolean bAutoRenewing;
+        public String OriginalJSON;
+        public String Signature;
+        public String ObfuscatedAccountID;
+        public String ObfuscatedProfileID;
+
+        PurchaseRecord(
+            String OrderID,
+            String PackageName,
+            String ProductID,
+            long PurchaseTime,
+            String PurchaseToken,
+            int PurchaseState,
+            String DeveloperPayload,
+            boolean bAcknowledged,
+            boolean bAutoRenewing,
+            String OriginalJSON,
+            String Signature,
+            String ObfuscatedAccountID,
+            String ObfuscatedProfileID)
+        {
+            this.OrderID = OrderID;
+            this.PackageName = PackageName;
+            this.ProductID = ProductID;
+            this.PurchaseTime = PurchaseTime;
+            this.PurchaseToken = PurchaseToken;
+            this.PurchaseState = PurchaseState;
+            this.DeveloperPayload = DeveloperPayload;
+            this.bAcknowledged = bAcknowledged;
+            this.bAutoRenewing = bAutoRenewing;
+            this.OriginalJSON = OriginalJSON;
+            this.Signature = Signature;
+            this.ObfuscatedAccountID = ObfuscatedAccountID;
+            this.ObfuscatedProfileID = ObfuscatedProfileID;
+        }
+    }
+
+	private final int PRODUCT_INAPP_ID = 0;
+    private final int PRODUCT_SUBS_ID = 1;
+    private final String[] ProductTypes =
+    {
+        "inapp",
+        "subs"
+    };
+
+    private final String[] FeatureTypes =
+    {
+        "inAppItemsOnVr",
+        "priceChangeConfirmation",
+        "subscriptions",
+        "subscriptionsOnVr",
+        "subscriptionsUpdate"
+    };
+
+	private final Activity GameActivity;
+    private final HashMap<String, PurchaseRecord> PurchaseRecords = new HashMap<>();
+    private final BillingClient AppBillingClient;
+
+	public AndroidPlayBilling(Activity GameActivity)
+	{
+		this.GameActivity = GameActivity;
+
+		final PurchasesUpdatedListener PurchasesListener = (Result, Purchases) ->
+		{
+			PurchaseRecord[] WrappedPurchaseRecords = null;
+			int WrappedPurchaseRecordsSize = 0;
+		    if (Purchases != null)
+		    {
+				WrappedPurchaseRecords = new PurchaseRecord[Purchases.size()];
+				WrappedPurchaseRecordsSize = Purchases.size();
+
+		        for (int Idx = 0; Idx < Purchases.size(); Idx++)
+		        {
+					// Wrap to our class
+					Purchase PurchaseRecord = Purchases.get(Idx);
+					PurchaseRecord WrappedPurchaseRecord = WrapToPurchaseRecord(PurchaseRecord);
+
+		            // Put record to hash map
+		            String ProductID = WrappedPurchaseRecord.ProductID;
+		            PurchaseRecords.put(ProductID, WrappedPurchaseRecord);
+
+					// Append to 'WrappedPurchaseRecords'
+					WrappedPurchaseRecords[Idx] = WrappedPurchaseRecord;
+
+					// Handle purchase
+					HandlePurchaseInternal(PurchaseRecord);
+		        }
+		    }
+
+			// Complete operation
+            NativeCompleteLaunchBillingFlow(
+                Result.getResponseCode(),
+                Result.getDebugMessage(),
+                WrappedPurchaseRecords,
+                WrappedPurchaseRecordsSize);
+		};
+
+		// Initialize billing client
+		AppBillingClient = BillingClient.newBuilder(GameActivity)
+            .setListener(PurchasesListener)
+            .enablePendingPurchases()
+            .build();
+
+		AppBillingClient.startConnection(new BillingClientStateListener()
+        {
+            @Override
+            public void onBillingSetupFinished(@NonNull BillingResult Result)
+            {
+				QueryBillingDetailsInternal();
+            }
+
+            // TODO: try to restart google billing
+            @Override
+            public void onBillingServiceDisconnected()
+            {
+                // Try to restart the connection on the next request to
+                // Google Play by calling the startConnection() method.
+            }
+        });
+
+		// Call native initializator
+		NativeInitialize(
+			SkuDetailsRecord.class,
+			PurchaseRecordFromHistory.class,
+			PurchaseRecord.class);
+	}
+
+	public void OnDestroy()
+	{
+		AppBillingClient.endConnection();
+	}
+
+	public void LaunchBillingFlow(String ProductID, int ProductType)
+    {
+		// Query Sku details & start purchase
+        QuerySkuDetailsInternal(new String[] { ProductID }, ProductType, (QueryResult, SkuDetailsList) ->
+        {
+			SkuDetails Details = ConstructSkuDetailsInternal(ProductID, ProductType);
+            if (SkuDetailsList != null && SkuDetailsList.size() > 0)
+			{
+				Details = SkuDetailsList.get(0);
+			}
+
+			// Build BillingFlowParams
+			BillingFlowParams FlowParams = BillingFlowParams.newBuilder()
+				.setSkuDetails(Details)
+			    .build();
+
+			BillingResult FlowResult = AppBillingClient.launchBillingFlow(GameActivity, FlowParams);
+			if (FlowResult.getResponseCode() != BillingClient.BillingResponseCode.OK)
+			{
+				// Complete operation
+			    NativeCompleteLaunchBillingFlow(
+			        FlowResult.getResponseCode(),
+			        FlowResult.getDebugMessage(),
+			        null,
+					0);
+			}
+			// else: wait for 'PurchasesListener' callback
+		});
+    }
+
+    public void LaunchPriceChangeConfirmationFlow(String ProductID, int ProductType)
+    {
+		// Query Sku details & start purchase
+		QuerySkuDetailsInternal(new String[] { ProductID }, ProductType, (QueryResult, SkuDetailsList) ->
+        {
+			SkuDetails Details = ConstructSkuDetailsInternal(ProductID, ProductType);
+            if (SkuDetailsList != null && SkuDetailsList.size() > 0)
+			{
+				Details = SkuDetailsList.get(0);
+			}
+
+			// Build PriceChangeParams
+			PriceChangeFlowParams PriceChangeParams = PriceChangeFlowParams.newBuilder()
+				.setSkuDetails(Details)
+				.build();
+	
+			AppBillingClient.launchPriceChangeConfirmationFlow(
+			    GameActivity,
+			    PriceChangeParams,
+			    FlowResult ->
+					// Complete operation
+			        NativeCompleteOperation(
+			            FlowResult.getResponseCode(),
+			            FlowResult.getDebugMessage()));
+		});
+	}
+
+    public void QueryPurchases(int ProductType)
+    {
+        Purchase.PurchasesResult Result = QueryPurchasesInternal(ProductType);
+        List<Purchase> Purchases = Result.getPurchasesList();
+
+        if (Result.getResponseCode() == BillingClient.BillingResponseCode.OK &&
+            Purchases != null)
+        {
+            // Construct array for wrapped records
+            int PurchasesSize = Purchases.size();
+            PurchaseRecord[] Records = new PurchaseRecord[PurchasesSize];
+            for (int Idx = 0; Idx < PurchasesSize; Idx++)
+            {
+                Records[Idx] = WrapToPurchaseRecord(Purchases.get(Idx));
+            }
+
+            // Complete operation
+            NativeCompleteQueryPurchases(
+                Result.getResponseCode(),
+                Result.getBillingResult().getDebugMessage(),
+                Records,
+				Records.length);
+        }
+        else
+        {
+            // Complete operation
+            NativeCompleteQueryPurchases(
+                Result.getResponseCode(),
+                Result.getBillingResult().getDebugMessage(),
+                null,
+				0);
+        }
+    }
+
+    public void QuerySkuDetails(String[] ProductIDs, int ProductType)
+    {
+        // Query Sku details & start purchase
+		QuerySkuDetailsInternal(ProductIDs, ProductType, (Result, SkuDetailsList) ->
+        {
+            if (Result.getResponseCode() == BillingClient.BillingResponseCode.OK &&
+                SkuDetailsList != null)
+            {
+                final int SkuDetailsSize = SkuDetailsList.size();
+                SkuDetailsRecord[] DetailsRecords = new SkuDetailsRecord[SkuDetailsSize];
+
+                for (int Idx = 0; Idx < SkuDetailsSize; Idx++)
+                {
+                    SkuDetails Details = SkuDetailsList.get(Idx);
+                    DetailsRecords[Idx] = WrapToSkuDetailsRecord(Details);
+                }
+
+                // Complete operation
+                NativeCompleteQuerySkuDetails(
+                    Result.getResponseCode(),
+                    Result.getDebugMessage(),
+                    DetailsRecords,
+					DetailsRecords.length);
+            }
+            else
+            {
+                // Complete operation
+                NativeCompleteQuerySkuDetails(
+                    Result.getResponseCode(),
+                    Result.getDebugMessage(),
+                    null,
+					0);
+            }
+        });
+    }
+
+    public void QueryPurchaseHistory(int ProductType)
+    {
+        AppBillingClient.queryPurchaseHistoryAsync(ProductTypes[ProductType], (Result, Purchases) ->
+        {
+            if (Result.getResponseCode() == BillingClient.BillingResponseCode.OK &&
+                Purchases != null)
+            {
+                // Construct array for wrapped records
+                int PurchasesSize = Purchases.size();
+                PurchaseRecordFromHistory[] Records = new PurchaseRecordFromHistory[PurchasesSize];
+                for (int Idx = 0; Idx < PurchasesSize; Idx++)
+                {
+                    Records[Idx] = WrapToPurchaseRecordFromHistory(Purchases.get(Idx));
+                }
+
+                // Complete operation
+                NativeCompleteQueryPurchaseHistory(
+                    Result.getResponseCode(),
+                    Result.getDebugMessage(),
+                    Records,
+					Records.length);
+            }
+            else
+            {
+                // Complete operation
+                NativeCompleteQueryPurchaseHistory(
+                    Result.getResponseCode(),
+                    Result.getDebugMessage(),
+                    null,
+					0);
+            }
+        });
+    }
+
+    public int IsFeatureSupported(int FeatureType)
+    {
+        BillingResult Result = AppBillingClient.isFeatureSupported(FeatureTypes[FeatureType]);
+        return Result.getResponseCode();
+    }
+
+    public boolean IsIAPInitialized()
+    {
+        if (AppBillingClient != null)
+        {
+            return AppBillingClient.isReady();
+        }
+
+        return false;
+    }
+
+    public boolean IsPurchased(String ProductID)
+    {
+        return PurchaseRecords.containsKey(ProductID);
+    }
+
+	// Internal
+	private Purchase.PurchasesResult QueryPurchasesInternal(int ProductType)
+    {
+        return AppBillingClient.queryPurchases(ProductTypes[ProductType]);
+    }
+
+	private void QueryBillingDetailsInternal()
+	{
+		// Query purchases on resume
+        Purchase.PurchasesResult SubscriptionsResult = QueryPurchasesInternal(PRODUCT_SUBS_ID);
+        Purchase.PurchasesResult ProductsResult = QueryPurchasesInternal(PRODUCT_INAPP_ID);
+
+		// Handle purchases
+		for (Purchase Subscription : SubscriptionsResult.getPurchasesList())
+		{
+			HandlePurchaseInternal(Subscription);
+		}
+
+		for (Purchase Product : ProductsResult.getPurchasesList())
+		{
+			HandlePurchaseInternal(Product);
+		}
+	}
+
+    private SkuDetails ConstructSkuDetailsInternal(String ProductID, int ProductType)
+	{
+		try
+		{
+		    String SkuDetailsJSON = new JSONObject()
+				.put("productId", ProductID)
+				.put("type", ProductTypes[ProductType])
+				.toString();
+
+		    return new SkuDetails(SkuDetailsJSON);
+		}
+		catch (JSONException ignored)
+		{
+			return null;
+		}
+	}
+
+	// Internal
+    private void QuerySkuDetailsInternal(
+        String[] ProductIDs,
+        int ProductType,
+        SkuDetailsResponseListener SkuDetailsListener)
+    {
+		// Build Sku details
+        List<String> SkuList = Arrays.asList(ProductIDs);
+        SkuDetailsParams SkuDetails = SkuDetailsParams.newBuilder()
+            .setType(ProductTypes[ProductType])
+            .setSkusList(SkuList)
+            .build();
+
+        // Query Sku details & start purchase
+        AppBillingClient.querySkuDetailsAsync(SkuDetails, SkuDetailsListener);
+    }
+
+	public void HandlePurchaseInternal(Purchase PurchaseRecord)
+    {
+        if (PurchaseRecord != null && PurchaseRecord.getDeveloperPayload().isEmpty())
+        {
+			// Try to consume item
+			ConsumeParams Params = ConsumeParams.newBuilder()
+			    .setPurchaseToken(PurchaseRecord.getPurchaseToken())
+			    .build();
+
+			AppBillingClient.consumeAsync(Params, (ConsumeResult, PurchaseToken) ->
+			{
+				// If item not consumed then acknowledge them
+				if (ConsumeResult.getResponseCode() != BillingClient.BillingResponseCode.OK)
+				{
+					AcknowledgePurchaseParams AcknowledgeParams = AcknowledgePurchaseParams.newBuilder()
+						.setPurchaseToken(PurchaseRecord.getPurchaseToken())
+						.build();
+
+					AppBillingClient.acknowledgePurchase(AcknowledgeParams, AcknowledgeResult -> {});
+				}
+			});
+		}
+    }
+
+	// Wrappers
+	private PurchaseRecord WrapToPurchaseRecord(Purchase Record)
+    {
+        // Check validity of 'getAccountIdentifiers'
+        String ObfuscatedAccountID = "";
+        String ObfuscatedProfileID = "";
+        AccountIdentifiers Identifiers = Record.getAccountIdentifiers();
+        if (Identifiers != null)
+        {
+            ObfuscatedAccountID = Identifiers.getObfuscatedAccountId();
+            ObfuscatedProfileID = Identifiers.getObfuscatedProfileId();
+        }
+
+        return new PurchaseRecord
+        (
+            Record.getOrderId(),
+            Record.getPackageName(),
+            Record.getSkus().get(0),
+            Record.getPurchaseTime(),
+            Record.getPurchaseToken(),
+            Record.getPurchaseState(),
+            Record.getDeveloperPayload(),
+            Record.isAcknowledged(),
+            Record.isAutoRenewing(),
+            Record.getOriginalJson(),
+            Record.getSignature(),
+            ObfuscatedAccountID,
+            ObfuscatedProfileID
+        );
+    }
+
+    private PurchaseRecordFromHistory WrapToPurchaseRecordFromHistory(PurchaseHistoryRecord Record)
+    {
+        return new PurchaseRecordFromHistory
+        (
+            Record.getSkus().get(0),
+            Record.getPurchaseTime(),
+            Record.getPurchaseToken(),
+            Record.getDeveloperPayload(),
+            Record.getOriginalJson(),
+            Record.getSignature()
+        );
+    }
+
+    private SkuDetailsRecord WrapToSkuDetailsRecord(SkuDetails Record)
+    {
+        return new SkuDetailsRecord(
+            Record.getOriginalJson(),
+            Record.getSku(),
+            Record.getType(),
+            Record.getPrice(),
+            Record.getPriceAmountMicros(),
+            Record.getPriceCurrencyCode(),
+            Record.getOriginalPrice(),
+            Record.getOriginalPriceAmountMicros(),
+            Record.getTitle(),
+            Record.getDescription(),
+            Record.getSubscriptionPeriod(),
+            Record.getFreeTrialPeriod(),
+            Record.getIntroductoryPrice(),
+            Record.getIntroductoryPriceAmountMicros(),
+            Record.getIntroductoryPricePeriod(),
+            Record.getIntroductoryPriceCycles(),
+            Record.getIconUrl()
+        );
+    }
+}

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/AndroidPlayBilling.Build.cs

+// Copyright (C) 2021. Nikita Klimov. All rights reserved.
+
+using UnrealBuildTool;
+
+public class AndroidPlayBilling : ModuleRules
+{
+	public AndroidPlayBilling(ReadOnlyTargetRules Target) : base(Target)
+	{
+        PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;
+        PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine" });
+
+        string PluginPath = Utils.MakePathRelativeTo(ModuleDirectory, Target.RelativeEnginePath);
+        if (Target.Platform == UnrealTargetPlatform.Android)
+        {
+            PrivateDependencyModuleNames.Add("Launch");
+            AdditionalPropertiesForReceipt.Add("AndroidPlugin", System.IO.Path.Combine(PluginPath, "AndroidPlayBilling_UPL_Android.xml"));
+        }
+    }
+}

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/AndroidPlayBilling_UPL_Android.xml

+<?xml version="1.0" encoding="utf-8"?>
+
+<root xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:tools="http://schemas.android.com/tools">
+
+	<!-- Add dependencies -->
+	<androidManifestUpdates>
+		<addPermission android:name="android.permission.INTERNET" />
+		<addPermission android:name="com.android.vending.BILLING" />
+	</androidManifestUpdates>
+
+	<!-- Copy Library directory & google-services.json -->
+	<gradleCopies>
+		<copyDir
+			src="$S(PluginDir)/Android/"
+			dst="$S(BuildDir)/gradle/app/src/main/java/com/kulichin/androidplaybilling/" />
+	</gradleCopies>
+
+	<!-- Import dependencies -->
+	<AARImports>
+		<insertValue value="com.android.billingclient,billing,4.0.0" />
+		<insertNewline />
+	</AARImports>
+
+	<!--Enable AndroidX support-->
+	<gradleProperties>
+		<insert>
+			android.useAndroidX = true
+			android.enableJetifier = true
+		</insert>
+	</gradleProperties>
+
+	<!-- Replace supportlib imports with AndroidX in engine source files -->
+	<baseBuildGradleAdditions>
+		<insert>
+			allprojects
+			{
+				def mappings =
+				[
+					'android.arch.lifecycle.Lifecycle':                 'androidx.lifecycle.Lifecycle',
+					'android.arch.lifecycle.LifecycleObserver':         'androidx.lifecycle.LifecycleObserver',
+					'android.arch.lifecycle.OnLifecycleEvent':          'androidx.lifecycle.OnLifecycleEvent',
+					'android.arch.lifecycle.ProcessLifecycleOwner':     'androidx.lifecycle.ProcessLifecycleOwner',
+					'android.arch.lifecycle':                           'androidx.lifecycle',
+					'android.support.annotation':                       'androidx.annotation',
+					'android.support.v13.app.FragmentCompat':           'androidx.legacy.app.FragmentCompat',
+					'android.support.v4.app.ActivityCompat':            'androidx.core.app.ActivityCompat',
+					'android.support.v4.app.NotificationCompat':        'androidx.core.app.NotificationCompat',
+					'android.support.v4.app.NotificationManagerCompat': 'androidx.core.app.NotificationManagerCompat',
+					'android.support.v4.content.ContextCompat':         'androidx.core.content.ContextCompat',
+					'android.support.v4.content.FileProvider':          'androidx.core.content.FileProvider',
+
+					'constProduct.getSku()':							'constProduct.getSkus().get(0)',
+					'ownedProduct.getSku()':							'ownedProduct.getSkus().get(0)',
+					'purchase.getSku()':							    'purchase.getSkus().get(0)',
+				]
+
+				beforeEvaluate { project ->
+					project.rootProject.projectDir.traverse(type: groovy.io.FileType.FILES, nameFilter: ~/.*\.java$/) { f ->
+						mappings.each { entry ->
+							if (f.getText('UTF-8').contains(entry.key)) {
+								println "Updating ${entry.key} to ${entry.value} in file ${f}"
+								ant.replace(file: f, token: entry.key, value: entry.value)
+							}
+						}
+					}
+				}
+			}
+		</insert>
+	</baseBuildGradleAdditions>
+
+	<!-- Gradle additions -->
+	<buildGradleAdditions>
+		<insert>
+			android
+			{
+				compileOptions
+				{
+					targetCompatibility JavaVersion.VERSION_1_8
+					sourceCompatibility JavaVersion.VERSION_1_8
+				}
+			}
+		</insert>
+	</buildGradleAdditions>
+
+	<!-- ProGuard additions -->
+	<proguardAdditions>
+		<insert>
+			-dontwarn com.kulichin.**
+			-keep class com.kulichin.** { *; }
+			-keep interface com.kulichin.** { *; }
+
+			-dontwarn com.android.billingclient.**
+			-keep class com.android.billingclient.** { *; }
+			-keep interface com.android.billingclient.** { *; }
+		</insert>
+	</proguardAdditions>
+
+	<!-- GameActivity.java additions -->
+	<gameActivityImportAdditions>
+		<insert>
+			import com.kulichin.androidplaybilling.AndroidPlayBilling;
+		</insert>
+	</gameActivityImportAdditions>
+
+	<!-- GameActivity.java additions -->
+	<gameActivityOnCreateAdditions>
+		<insert>
+			// Initialize billing class
+<!--			PlayBilling = new AndroidPlayBilling(this);-->
+		</insert>
+	</gameActivityOnCreateAdditions>
+
+	<!-- GameActivity.java additions -->
+	<gameActivityOnDestroyAdditions>
+		<insert>
+			PlayBilling.OnDestroy();
+		</insert>
+	</gameActivityOnDestroyAdditions>
+
+	<!-- GameActivity.java additions -->
+	<gameActivityClassAdditions>
+		<insert>
+			private AndroidPlayBilling PlayBilling;
+			public void AndroidThunkJava_LaunchBillingFlow(String ProductID, int ProductType)
+			{
+				PlayBilling.LaunchBillingFlow(ProductID, ProductType);
+			}
+
+			public void AndroidThunkJava_LaunchPriceChangeConfirmationFlow(String ProductID, int ProductType)
+			{
+				PlayBilling.LaunchPriceChangeConfirmationFlow(ProductID, ProductType);
+			}
+
+			public void AndroidThunkJava_QueryPurchases(int ProductType)
+			{
+				PlayBilling.QueryPurchases(ProductType);
+			}
+
+			public void AndroidThunkJava_QuerySkuDetails(String[] ProductIDs, int ProductType)
+			{
+				PlayBilling.QuerySkuDetails(ProductIDs, ProductType);
+			}
+
+			public void AndroidThunkJava_QueryPurchaseHistory(int ProductType)
+			{
+				PlayBilling.QueryPurchaseHistory(ProductType);
+			}
+
+			public int AndroidThunkJava_IsFeatureSupported(int FeatureType)
+			{
+				return PlayBilling.IsFeatureSupported(FeatureType);
+			}
+
+			public boolean AndroidThunkJava_IsIAPInitialized()
+			{
+				return PlayBilling.IsIAPInitialized();
+			}
+
+			public boolean AndroidThunkJava_IsPurchased(String ProductID)
+			{
+				return PlayBilling.IsPurchased(ProductID);
+			}
+
+		</insert>
+	</gameActivityClassAdditions>
+
+</root>

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/Private/AndroidPlayBilling.cpp

+// Copyright (C) 2021. Nikita Klimov. All rights reserved.
+
+#include "AndroidPlayBilling.h"
+#include "AndroidPlayBillingSettings.h"
+#include "Settings/Public/ISettingsModule.h"
+
+#define LOCTEXT_NAMESPACE "FAndroidPlayBillingModule"
+
+void FAndroidPlayBillingModule::StartupModule()
+{
+    if (ISettingsModule* SettingsModule = FModuleManager::GetModulePtr<ISettingsModule>("Settings"))
+	{
+		SettingsModule->RegisterSettings(
+			TEXT("Project"), 
+			TEXT("Plugins"), 
+			TEXT("Android Play Billing"),
+			LOCTEXT("Android Play Billing", "Android Play Billing"),
+			LOCTEXT("Android Play Billing", "Settings for Android Play Billing"),
+			GetMutableDefault<UAndroidPlayBillingSettings>());
+	}
+}
+
+void FAndroidPlayBillingModule::ShutdownModule()
+{
+    if (ISettingsModule* SettingsModule = FModuleManager::GetModulePtr<ISettingsModule>("Settings"))
+	{
+		SettingsModule->UnregisterSettings(
+			TEXT("Project"),
+			TEXT("Plugins"),
+			TEXT("AndroidPlayBilling"));
+	}
+}
+
+FAndroidPlayBillingModule* FAndroidPlayBillingModule::GetModule()
+{
+	return FModuleManager::Get().GetModulePtr<FAndroidPlayBillingModule>("AndroidPlayBilling");
+}
+
+#undef LOCTEXT_NAMESPACE
+IMPLEMENT_MODULE(FAndroidPlayBillingModule, AndroidPlayBilling)

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/Private/AndroidPlayBillingSettings.cpp

+// Copyright (C) 2021. Nikita Klimov. All rights reserved.
+
+#include "AndroidPlayBillingSettings.h"
+
+#if WITH_EDITOR
+void UAndroidPlayBillingSettings::PostEditChangeProperty(struct FPropertyChangedEvent& PropertyChangedEvent)
+{
+	Super::PostEditChangeProperty(PropertyChangedEvent);
+	SaveConfig(CPF_Config, *GetDefaultConfigFilename());
+}
+#endif

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/Private/AndroidPlayBillingSubsystem.cpp

+// Copyright (C) 2021. Nikita Klimov. All rights reserved.
+
+#include "AndroidPlayBillingSubsystem.h"
+
+#if PLATFORM_ANDROID
+
+#include "AndroidPlayBilling.h"
+#include "Android/AndroidJNI.h"
+#include "Android/AndroidApplication.h"
+
+// SkuDetails class fields
+static jfieldID SkuDetailsRecord_OriginalJSON_FieldID;
+static jfieldID SkuDetailsRecord_ProductID_FieldID;
+static jfieldID SkuDetailsRecord_Type_FieldID;
+static jfieldID SkuDetailsRecord_Price_FieldID;
+static jfieldID SkuDetailsRecord_PriceAmountMicros_FieldID;
+static jfieldID SkuDetailsRecord_PriceCurrencyCode_FieldID;
+static jfieldID SkuDetailsRecord_OriginalPrice_FieldID;
+static jfieldID SkuDetailsRecord_OriginalPriceAmountMicros_FieldID;
+static jfieldID SkuDetailsRecord_Title_FieldID;
+static jfieldID SkuDetailsRecord_Description_FieldID;
+static jfieldID SkuDetailsRecord_SubscriptionPeriod_FieldID;
+static jfieldID SkuDetailsRecord_FreeTrialPeriod_FieldID;
+static jfieldID SkuDetailsRecord_IntroductoryPrice_FieldID;
+static jfieldID SkuDetailsRecord_IntroductoryPriceAmountMicros_FieldID;
+static jfieldID SkuDetailsRecord_IntroductoryPricePeriod_FieldID;
+static jfieldID SkuDetailsRecord_IntroductoryPriceCycles_FieldID;
+static jfieldID SkuDetailsRecord_IconURL_FieldID;
+
+// PurchaseRecordFromHistory class fields
+static jfieldID PurchaseRecordFromHistory_ProductID_FieldID;
+static jfieldID PurchaseRecordFromHistory_PurchaseTime_FieldID;
+static jfieldID PurchaseRecordFromHistory_PurchaseToken_FieldID;
+static jfieldID PurchaseRecordFromHistory_DeveloperPayload_FieldID;
+static jfieldID PurchaseRecordFromHistory_OriginalJSON_FieldID;
+static jfieldID PurchaseRecordFromHistory_Signature_FieldID;
+
+// PurchaseRecord class fields
+static jfieldID PurchaseRecord_OrderID_FieldID;
+static jfieldID PurchaseRecord_PackageName_FieldID;
+static jfieldID PurchaseRecord_ProductID_FieldID;
+static jfieldID PurchaseRecord_PurchaseTime_FieldID;
+static jfieldID PurchaseRecord_PurchaseToken_FieldID;
+static jfieldID PurchaseRecord_PurchaseState_FieldID;
+static jfieldID PurchaseRecord_DeveloperPayload_FieldID;
+static jfieldID PurchaseRecord_bAcknowledged_FieldID;
+static jfieldID PurchaseRecord_bAutoRenewing_FieldID;
+static jfieldID PurchaseRecord_OriginalJSON_FieldID;
+static jfieldID PurchaseRecord_Signature_FieldID;
+static jfieldID PurchaseRecord_ObfuscatedAccountID_FieldID;
+static jfieldID PurchaseRecord_ObfuscatedProfileID_FieldID;
+
+// Google Play Billing methods
+static jmethodID LaunchBillingFlow_MethodID;
+static jmethodID LaunchPriceChangeConfirmationFlow_MethodID;
+static jmethodID QueryPurchases_MethodID;
+static jmethodID QuerySkuDetails_MethodID;
+static jmethodID QueryPurchaseHistory_MethodID;
+static jmethodID IsFeatureSupported_MethodID;
+static jmethodID IsIAPInitialized_MethodID;
+static jmethodID IsPurchased_MethodID;
+
+static inline FScopedJavaObject<jstring> GetScopedStringFromObject(
+	JNIEnv* Env, 
+	jobject Object, 
+	jfieldID FieldID)
+{
+    if (FieldID == NULL)
+    {
+        return FScopedJavaObject<jstring>(Env, Env->NewStringUTF(""));
+    }
+
+	return NewScopedJavaObject(Env, (jstring) Env->GetObjectField(Object, FieldID));
+}
+
+static jmethodID FindMethod(
+	JNIEnv* Env, 
+	const char* Name, 
+	const char* Signature)
+{
+	if (Env && Name && Signature)
+	{
+		return Env->GetMethodID(FJavaWrapper::GameActivityClassID, Name, Signature);
+	}
+
+	return nullptr;
+}
+
+static jfieldID FindField(
+	JNIEnv* Env, 
+	jclass Class, 
+	const char* Name, 
+	const char* Type)
+{
+	if (Env && Name && Type && Class)
+	{
+		return Env->GetFieldID(Class, Name, Type);
+	}
+	
+	return nullptr;
+}
+
+static bool CallBooleanMethod(JNIEnv* Env, jmethodID Method, ...)
+{
+	// make sure the function exists
+	jobject Object = FJavaWrapper::GameActivityThis;
+	if (Method == NULL || Object == NULL || Env == NULL)
+	{
+		return false;
+	}
+
+	va_list Args;
+	va_start(Args, Method);
+	return Env->CallBooleanMethodV(Object, Method, Args);
+	va_end(Args);
+}
+
+static bool CallIntMethod(JNIEnv* Env, jmethodID Method, ...)
+{
+	// make sure the function exists
+	jobject Object = FJavaWrapper::GameActivityThis;
+	if (Method == NULL || Object == NULL || Env == NULL)
+	{
+		return false;
+	}
+
+	va_list Args;
+	va_start(Args, Method);
+	return Env->CallIntMethodV(Object, Method, Args);
+	va_end(Args);
+}
+
+static void CallVoidMethod(JNIEnv* Env, jmethodID Method, ...)
+{
+	// make sure the function exists
+	jobject Object = FJavaWrapper::GameActivityThis;
+	if (Method == NULL || Object == NULL || Env == NULL)
+	{
+		return;
+	}
+
+	va_list Args;
+	va_start(Args, Method);
+	Env->CallVoidMethodV(Object, Method, Args);
+	va_end(Args);
+}
+
+static jobject CallObjectMethod(JNIEnv* Env, jmethodID Method)
+{
+	// make sure the function exists
+	jobject Object = FJavaWrapper::GameActivityThis;
+	if (Method == NULL || Object == NULL || Env == NULL)
+	{
+		return NULL;
+	}
+
+	return Env->CallObjectMethod(Object, Method);
+}
+
+FPurchaseRecord GetPurchaseRecordStructFromJavaObject(JNIEnv* Env, jobject Object)
+{
+	if (Object == NULL || Env == NULL)
+	{
+		return {};
+	}
+	
+	// PurchaseRecord class fields
+	auto JOrderID					= GetScopedStringFromObject(Env, Object, PurchaseRecord_OrderID_FieldID);
+	auto JPackageName				= GetScopedStringFromObject(Env, Object, PurchaseRecord_PackageName_FieldID);
+	auto JProductID					= GetScopedStringFromObject(Env, Object, PurchaseRecord_ProductID_FieldID);
+	int64 PurchaseTime				= (int64)Env->GetLongField(Object, PurchaseRecord_PurchaseTime_FieldID);
+	auto JPurchaseToken				= GetScopedStringFromObject(Env, Object, PurchaseRecord_PurchaseToken_FieldID);
+	EPurchaseState PurchaseState	= (EPurchaseState)Env->GetIntField(Object, PurchaseRecord_PurchaseState_FieldID);
+	auto JDeveloperPayload			= GetScopedStringFromObject(Env, Object, PurchaseRecord_DeveloperPayload_FieldID);
+	bool bAcknowledged				= (bool)Env->GetBooleanField(Object, PurchaseRecord_bAcknowledged_FieldID);
+	bool bAutoRenewing				= (bool)Env->GetBooleanField(Object, PurchaseRecord_bAutoRenewing_FieldID);
+	auto JOriginalJSON				= GetScopedStringFromObject(Env, Object, PurchaseRecord_OriginalJSON_FieldID);
+	auto JSignature					= GetScopedStringFromObject(Env, Object, PurchaseRecord_Signature_FieldID);
+	auto JObfuscatedAccountID		= GetScopedStringFromObject(Env, Object, PurchaseRecord_ObfuscatedAccountID_FieldID);
+	auto JObfuscatedProfileID		= GetScopedStringFromObject(Env, Object, PurchaseRecord_ObfuscatedProfileID_FieldID);
+
+	// Construct FPurchaseRecord struct
+	return
+	{
+		FJavaHelper::FStringFromParam(Env, *JOrderID),
+		FJavaHelper::FStringFromParam(Env, *JPackageName),
+		FJavaHelper::FStringFromParam(Env, *JProductID),
+		PurchaseTime,
+		FJavaHelper::FStringFromParam(Env, *JPurchaseToken),
+		PurchaseState,
+		FJavaHelper::FStringFromParam(Env, *JDeveloperPayload),
+		bAcknowledged,
+		bAutoRenewing,
+		FJavaHelper::FStringFromParam(Env, *JOriginalJSON),
+		FJavaHelper::FStringFromParam(Env, *JSignature),
+		FJavaHelper::FStringFromParam(Env, *JObfuscatedAccountID),
+		FJavaHelper::FStringFromParam(Env, *JObfuscatedProfileID)
+	};
+}
+
+FPurchaseRecordFromHistory GetPurchaseRecordFromHistoryStructFromJavaObject(JNIEnv* Env, jobject Object)
+{
+	if (Object == NULL || Env == NULL)
+	{
+		return {};
+	}
+
+	// PurchaseRecordFromHistory class fields
+	auto JProductID			= GetScopedStringFromObject(Env, Object, PurchaseRecordFromHistory_ProductID_FieldID);
+	int64 PurchaseTime		= (int64)Env->GetLongField(Object, PurchaseRecordFromHistory_PurchaseTime_FieldID);
+	auto JPurchaseToken		= GetScopedStringFromObject(Env, Object, PurchaseRecordFromHistory_PurchaseToken_FieldID);
+	auto JDeveloperPayload	= GetScopedStringFromObject(Env, Object, PurchaseRecordFromHistory_DeveloperPayload_FieldID);
+	auto JOriginalJSON		= GetScopedStringFromObject(Env, Object, PurchaseRecordFromHistory_OriginalJSON_FieldID);
+	auto JSignature			= GetScopedStringFromObject(Env, Object, PurchaseRecordFromHistory_Signature_FieldID);
+
+	// Construct FPurchaseRecordFromHistory struct
+	return
+	{
+		FJavaHelper::FStringFromParam(Env, *JProductID),
+		PurchaseTime,
+		FJavaHelper::FStringFromParam(Env, *JPurchaseToken),
+		FJavaHelper::FStringFromParam(Env, *JDeveloperPayload),
+		FJavaHelper::FStringFromParam(Env, *JOriginalJSON),
+		FJavaHelper::FStringFromParam(Env, *JSignature),
+	};
+}
+
+FSkuDetailsRecord GetSkuDetailsRecordStructFromJavaObject(JNIEnv* Env, jobject Object)
+{
+	if (Object == NULL || Env == NULL)
+	{
+		return {};
+	}
+
+	// SkuDetailsRecord class fields
+	auto JOriginalJSON					= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_OriginalJSON_FieldID);
+	auto JProductID						= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_ProductID_FieldID);
+	auto JType							= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_Type_FieldID);
+	auto JPrice							= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_Price_FieldID);
+	int64 PriceAmountMicros				= (int64)Env->GetLongField(Object, SkuDetailsRecord_PriceAmountMicros_FieldID);
+	auto JPriceCurrencyCode				= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_PriceCurrencyCode_FieldID);
+	auto JOriginalPrice					= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_OriginalPrice_FieldID);
+	int64 OriginalPriceAmountMicros		= (int64)Env->GetLongField(Object, SkuDetailsRecord_OriginalPriceAmountMicros_FieldID);
+	auto JTitle							= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_Title_FieldID);
+	auto JDescription					= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_Description_FieldID);
+	auto JSubscriptionPeriod			= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_SubscriptionPeriod_FieldID);
+	auto JFreeTrialPeriod				= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_FreeTrialPeriod_FieldID);
+	auto JIntroductoryPrice				= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_IntroductoryPrice_FieldID);
+	int64 IntroductoryPriceAmountMicros	= (int64)Env->GetLongField(Object, SkuDetailsRecord_IntroductoryPriceAmountMicros_FieldID);
+	auto JIntroductoryPricePeriod		= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_IntroductoryPricePeriod_FieldID);
+	int IntroductoryPriceCycles			= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_IntroductoryPriceCycles_FieldID);
+	auto JIconURL						= GetScopedStringFromObject(Env, Object, SkuDetailsRecord_IconURL_FieldID);
+
+	// Construct FSkuDetailsRecord struct
+	return
+	{
+		FJavaHelper::FStringFromParam(Env, *JOriginalJSON),
+		FJavaHelper::FStringFromParam(Env, *JProductID),
+		FJavaHelper::FStringFromParam(Env, *JType),
+		FJavaHelper::FStringFromParam(Env, *JPrice),
+		PriceAmountMicros,
+		FJavaHelper::FStringFromParam(Env, *JPriceCurrencyCode),
+		FJavaHelper::FStringFromParam(Env, *JOriginalPrice),
+		OriginalPriceAmountMicros,
+		FJavaHelper::FStringFromParam(Env, *JTitle),
+		FJavaHelper::FStringFromParam(Env, *JDescription),
+		FJavaHelper::FStringFromParam(Env, *JSubscriptionPeriod),
+		FJavaHelper::FStringFromParam(Env, *JFreeTrialPeriod),
+		FJavaHelper::FStringFromParam(Env, *JIntroductoryPrice),
+		IntroductoryPriceAmountMicros,
+		FJavaHelper::FStringFromParam(Env, *JIntroductoryPricePeriod),
+		IntroductoryPriceCycles,
+		FJavaHelper::FStringFromParam(Env, *JIconURL),
+	};
+}
+
+#endif
+
+void UAndroidPlayBillingSubsystem::LaunchBillingFlow(
+	FOnLaunchBillingFlowCompleted OnOperationResult,
+	const FString& ProductID,
+	const ESkuType ProductType)
+{
+#if PLATFORM_ANDROID
+	if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
+	{
+		if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+		{
+			// Bind callback
+			Module->AddOnLaunchBillingFlowCompleted_Handle(OnOperationResult);
+
+			auto JProductID = FJavaHelper::ToJavaString(Env, ProductID);
+			
+			// Call Java method
+			CallVoidMethod(
+				Env,
+				LaunchBillingFlow_MethodID,
+				*JProductID,
+				(int)ProductType);
+		}
+	}
+#endif
+}
+
+void UAndroidPlayBillingSubsystem::LaunchPriceChangeConfirmationFlow(
+	FOnOperationCompleted OnOperationResult,
+	const FString& ProductID,
+	const ESkuType ProductType)
+{
+#if PLATFORM_ANDROID
+	if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
+	{
+		if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+		{
+			// Bind callback
+			Module->AddOnOperationCompleted_Handle(OnOperationResult);
+
+			auto JProductID = FJavaHelper::ToJavaString(Env, ProductID);
+			
+			// Call Java method
+			CallVoidMethod(
+				Env,
+				LaunchPriceChangeConfirmationFlow_MethodID,
+				*JProductID,
+				(int)ProductType);
+		}
+	}
+#endif
+}
+
+void UAndroidPlayBillingSubsystem::QueryPurchases(
+	FOnQueryPurchasesCompleted OnOperationResult,
+	const ESkuType ProductType)
+{
+#if PLATFORM_ANDROID
+	if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
+	{
+		if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+		{
+			// Bind callback
+			Module->AddOnQueryPurchasesCompleted_Handle(OnOperationResult);
+
+			// Call Java method
+			CallVoidMethod(Env, QueryPurchases_MethodID, (int)ProductType);
+		}
+	}
+#endif
+}
+
+void UAndroidPlayBillingSubsystem::QuerySkuDetails(
+	FOnQuerySkuDetailsCompleted OnOperationResult,
+	const TArray<FString>& ProductIDs,
+	const ESkuType ProductType)
+{
+#if PLATFORM_ANDROID
+	if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
+	{
+		if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+		{
+			// Bind callback
+			Module->AddOnQuerySkuDetailsCompleted_Handle(OnOperationResult);
+
+			// Populate some java types with the provided product information
+			auto JProductIDs = NewScopedJavaObject(
+				Env,
+				(jobjectArray)Env->NewObjectArray(ProductIDs.Num(),
+				FJavaWrapper::JavaStringClass,
+				NULL));
+			
+			for (int Idx = 0; Idx < ProductIDs.Num(); Idx++)
+			{
+				auto JProductID = FJavaHelper::ToJavaString(Env, ProductIDs[Idx]);
+				Env->SetObjectArrayElement(*JProductIDs, Idx, *JProductID);
+			}
+
+			// Call Java method
+			CallVoidMethod(
+				Env,
+				QuerySkuDetails_MethodID,
+				*JProductIDs,
+				(int)ProductType);
+		}
+	}
+#endif
+}
+
+void UAndroidPlayBillingSubsystem::QueryPurchaseHistory(
+	FOnQueryPurchaseHistoryCompleted OnOperationResult,
+	const ESkuType ProductType)
+{
+#if PLATFORM_ANDROID
+	if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
+	{
+		if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+		{
+			// Bind callback
+			Module->AddOnQueryPurchaseHistoryCompleted_Handle(OnOperationResult);
+
+			// Call Java method
+			CallVoidMethod(Env, QueryPurchaseHistory_MethodID, (int)ProductType);
+		}
+	}
+#endif
+}
+
+EBillingResponseCode UAndroidPlayBillingSubsystem::IsFeatureSupported(const EFeatureType FeatureType)
+{
+#if PLATFORM_ANDROID
+	if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
+	{
+		// Call Java method
+		return (EBillingResponseCode) CallIntMethod(Env, IsFeatureSupported_MethodID, (int) FeatureType);
+	}
+#endif
+
+	return EBillingResponseCode::SERVICE_UNAVAILABLE;
+}
+
+bool UAndroidPlayBillingSubsystem::IsIAPInitialized()
+{
+#if PLATFORM_ANDROID
+	if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
+	{
+		// Call Java method
+		return CallBooleanMethod(Env, IsIAPInitialized_MethodID);
+	}
+#endif
+
+	return false;
+}
+
+bool UAndroidPlayBillingSubsystem::IsPurchased(const FString& ProductID)
+{
+#if PLATFORM_ANDROID
+	if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
+	{
+		auto JProductID = FJavaHelper::ToJavaString(Env, ProductID);
+		
+		// Call Java method
+		return CallBooleanMethod(Env, IsIAPInitialized_MethodID, *JProductID);
+	}
+#endif
+
+	return false;
+}
+
+#if PLATFORM_ANDROID
+JNI_METHOD void Java_com_kulichin_androidplaybilling_AndroidPlayBilling_NativeInitialize(
+	JNIEnv* Env, 
+	jobject Thiz,
+	jclass SkuDetailsRecordClass,
+	jclass PurchaseRecordFromHistoryClass,
+	jclass PurchaseRecordClass)
+{
+	// SkuDetailsRecord class fields
+	SkuDetailsRecord_OriginalJSON_FieldID					= FindField(Env, SkuDetailsRecordClass, "OriginalJSON",					"Ljava/lang/String;");
+	SkuDetailsRecord_ProductID_FieldID						= FindField(Env, SkuDetailsRecordClass, "ProductID",					"Ljava/lang/String;");
+	SkuDetailsRecord_Type_FieldID							= FindField(Env, SkuDetailsRecordClass, "Type",							"Ljava/lang/String;");
+	SkuDetailsRecord_Price_FieldID							= FindField(Env, SkuDetailsRecordClass, "Price",						"Ljava/lang/String;");
+	SkuDetailsRecord_PriceAmountMicros_FieldID				= FindField(Env, SkuDetailsRecordClass, "PriceAmountMicros",			"J");
+	SkuDetailsRecord_PriceCurrencyCode_FieldID				= FindField(Env, SkuDetailsRecordClass, "PriceCurrencyCode",			"Ljava/lang/String;");
+	SkuDetailsRecord_OriginalPrice_FieldID					= FindField(Env, SkuDetailsRecordClass, "OriginalPrice",				"Ljava/lang/String;");
+	SkuDetailsRecord_OriginalPriceAmountMicros_FieldID		= FindField(Env, SkuDetailsRecordClass, "OriginalPriceAmountMicros",	"J");
+	SkuDetailsRecord_Title_FieldID							= FindField(Env, SkuDetailsRecordClass, "Title",						"Ljava/lang/String;");
+	SkuDetailsRecord_Description_FieldID					= FindField(Env, SkuDetailsRecordClass, "Description",					"Ljava/lang/String;");
+	SkuDetailsRecord_SubscriptionPeriod_FieldID				= FindField(Env, SkuDetailsRecordClass, "SubscriptionPeriod",			"Ljava/lang/String;");
+	SkuDetailsRecord_FreeTrialPeriod_FieldID				= FindField(Env, SkuDetailsRecordClass, "FreeTrialPeriod",				"Ljava/lang/String;");
+	SkuDetailsRecord_IntroductoryPrice_FieldID				= FindField(Env, SkuDetailsRecordClass, "IntroductoryPrice",			"Ljava/lang/String;");
+	SkuDetailsRecord_IntroductoryPriceAmountMicros_FieldID	= FindField(Env, SkuDetailsRecordClass, "IntroductoryPriceAmountMicros","J");
+	SkuDetailsRecord_IntroductoryPricePeriod_FieldID		= FindField(Env, SkuDetailsRecordClass, "IntroductoryPricePeriod",		"Ljava/lang/String;");
+	SkuDetailsRecord_IntroductoryPriceCycles_FieldID		= FindField(Env, SkuDetailsRecordClass, "IntroductoryPriceCycles",		"I");
+	SkuDetailsRecord_IconURL_FieldID						= FindField(Env, SkuDetailsRecordClass, "IconURL",						"Ljava/lang/String;");
+	
+	// PurchaseRecordFromHistory class fields
+	PurchaseRecordFromHistory_ProductID_FieldID			= FindField(Env, PurchaseRecordFromHistoryClass, "ProductID",		"Ljava/lang/String;");
+	PurchaseRecordFromHistory_PurchaseTime_FieldID		= FindField(Env, PurchaseRecordFromHistoryClass, "PurchaseTime",	"J");
+	PurchaseRecordFromHistory_PurchaseToken_FieldID		= FindField(Env, PurchaseRecordFromHistoryClass, "PurchaseToken",	"Ljava/lang/String;");
+	PurchaseRecordFromHistory_DeveloperPayload_FieldID	= FindField(Env, PurchaseRecordFromHistoryClass, "DeveloperPayload","Ljava/lang/String;");
+	PurchaseRecordFromHistory_OriginalJSON_FieldID		= FindField(Env, PurchaseRecordFromHistoryClass, "OriginalJSON",	"Ljava/lang/String;");
+	PurchaseRecordFromHistory_Signature_FieldID			= FindField(Env, PurchaseRecordFromHistoryClass, "Signature",		"Ljava/lang/String;");
+	
+	// PurchaseRecord class fields
+	PurchaseRecord_OrderID_FieldID				= FindField(Env, PurchaseRecordClass, "OrderID",			"Ljava/lang/String;");
+	PurchaseRecord_PackageName_FieldID			= FindField(Env, PurchaseRecordClass, "PackageName",		"Ljava/lang/String;");
+	PurchaseRecord_ProductID_FieldID			= FindField(Env, PurchaseRecordClass, "ProductID",			"Ljava/lang/String;");
+	PurchaseRecord_PurchaseTime_FieldID			= FindField(Env, PurchaseRecordClass, "PurchaseTime",		"J");
+	PurchaseRecord_PurchaseToken_FieldID		= FindField(Env, PurchaseRecordClass, "PurchaseToken",		"Ljava/lang/String;");
+	PurchaseRecord_PurchaseState_FieldID		= FindField(Env, PurchaseRecordClass, "PurchaseState",		"I");
+	PurchaseRecord_DeveloperPayload_FieldID		= FindField(Env, PurchaseRecordClass, "DeveloperPayload",	"Ljava/lang/String;");
+	PurchaseRecord_bAcknowledged_FieldID		= FindField(Env, PurchaseRecordClass, "bAcknowledged",		"Z");
+	PurchaseRecord_bAutoRenewing_FieldID		= FindField(Env, PurchaseRecordClass, "bAutoRenewing",		"Z");
+	PurchaseRecord_OriginalJSON_FieldID			= FindField(Env, PurchaseRecordClass, "OriginalJSON",		"Ljava/lang/String;");
+	PurchaseRecord_Signature_FieldID			= FindField(Env, PurchaseRecordClass, "Signature",			"Ljava/lang/String;");
+	PurchaseRecord_ObfuscatedAccountID_FieldID	= FindField(Env, PurchaseRecordClass, "ObfuscatedAccountID","Ljava/lang/String;");
+	PurchaseRecord_ObfuscatedProfileID_FieldID	= FindField(Env, PurchaseRecordClass, "ObfuscatedProfileID","Ljava/lang/String;");
+	
+	// Find Google Play Billing methods
+	LaunchBillingFlow_MethodID					= FindMethod(Env, "AndroidThunkJava_LaunchBillingFlow",						"(Ljava/lang/String;I)V");
+	LaunchPriceChangeConfirmationFlow_MethodID	= FindMethod(Env, "AndroidThunkJava_LaunchPriceChangeConfirmationFlow",		"(Ljava/lang/String;I)V");
+	QueryPurchases_MethodID						= FindMethod(Env, "AndroidThunkJava_QueryPurchases",						"(I)V");
+	QuerySkuDetails_MethodID					= FindMethod(Env, "AndroidThunkJava_QuerySkuDetails",						"([Ljava/lang/String;I)V");
+	QueryPurchaseHistory_MethodID				= FindMethod(Env, "AndroidThunkJava_QueryPurchaseHistory",					"(I)V");
+	IsFeatureSupported_MethodID					= FindMethod(Env, "AndroidThunkJava_IsFeatureSupported",					"(I)I");
+	IsIAPInitialized_MethodID					= FindMethod(Env, "AndroidThunkJava_IsIAPInitialized",						"()Z");
+	IsPurchased_MethodID						= FindMethod(Env, "AndroidThunkJava_IsPurchased",							"(Ljava/lang/String;)Z");
+}
+
+JNI_METHOD void Java_com_kulichin_androidplaybilling_AndroidPlayBilling_NativeCompleteOperation(
+	JNIEnv* Env, 
+	jobject Thiz, 
+	jint ResponseCode,
+	jstring ResponseMessage)
+{
+	if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+	{
+		Module->TriggerOnOperationCompleted
+		(
+			(EBillingResponseCode)ResponseCode,
+			FJavaHelper::FStringFromParam(Env, ResponseMessage)
+		);
+	}
+}
+
+JNI_METHOD void Java_com_kulichin_androidplaybilling_AndroidPlayBilling_NativeCompleteLaunchBillingFlow(
+	JNIEnv* Env, 
+	jobject Thiz, 
+	jint ResponseCode,
+	jstring ResponseMessage,
+	jobjectArray Array,
+	jint ArraySize)
+{
+	if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+	{
+		// Convert java record
+		TArray<FPurchaseRecord> PurchaseRecords = {};
+		for (int Idx = 0; Idx < ArraySize; Idx++)
+		{
+			// Get element from java array
+			auto JPurchaseRecord = NewScopedJavaObject(Env, Env->GetObjectArrayElement(Array, Idx));
+
+			// Construct struct & add to array
+			PurchaseRecords.Add(GetPurchaseRecordStructFromJavaObject(Env, *JPurchaseRecord));
+		}
+
+		Module->TriggerOnLaunchBillingFlowCompleted
+		(
+			(EBillingResponseCode)ResponseCode,
+			FJavaHelper::FStringFromParam(Env, ResponseMessage),
+			PurchaseRecords
+		);
+	}
+}
+
+JNI_METHOD void Java_com_kulichin_androidplaybilling_AndroidPlayBilling_NativeCompleteQueryPurchaseHistory(
+	JNIEnv* Env, 
+	jobject Thiz, 
+	jint ResponseCode,
+	jstring ResponseMessage,
+	jobjectArray Array,
+	jint ArraySize)
+{
+	if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+	{
+		// Convert java record
+		TArray<FPurchaseRecordFromHistory> PurchaseRecordsFromHistory = {};
+		for (int Idx = 0; Idx < ArraySize; Idx++)
+		{
+			// Get element from java array
+			auto JRecordFromHistory = NewScopedJavaObject(Env, Env->GetObjectArrayElement(Array, Idx));
+
+			// Construct struct & add to array
+			PurchaseRecordsFromHistory.Add(GetPurchaseRecordFromHistoryStructFromJavaObject(Env, *JRecordFromHistory));
+		}
+
+		Module->TriggerOnQueryPurchaseHistoryCompleted
+		(
+			(EBillingResponseCode)ResponseCode,
+			FJavaHelper::FStringFromParam(Env, ResponseMessage),
+			PurchaseRecordsFromHistory
+		);
+	}
+}
+
+JNI_METHOD void Java_com_kulichin_androidplaybilling_AndroidPlayBilling_NativeCompleteQuerySkuDetails(
+	JNIEnv* Env, 
+	jobject Thiz, 
+	jint ResponseCode,
+	jstring ResponseMessage,
+	jobjectArray Array,
+	jint ArraySize)
+{
+	if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+	{
+		// Convert java record
+		TArray<FSkuDetailsRecord> SkuDetailsRecords = {};
+		for (int Idx = 0; Idx < ArraySize; Idx++)
+		{
+			// Get element from java array
+			auto JSkuDetailsRecord = NewScopedJavaObject(Env, Env->GetObjectArrayElement(Array, Idx));
+
+			// Construct struct & add to array
+			SkuDetailsRecords.Add(GetSkuDetailsRecordStructFromJavaObject(Env, *JSkuDetailsRecord));
+		}
+
+		Module->TriggerOnQuerySkuDetailsCompleted
+		(
+			(EBillingResponseCode)ResponseCode,
+			FJavaHelper::FStringFromParam(Env, ResponseMessage),
+			SkuDetailsRecords
+		);
+	}
+}
+
+JNI_METHOD void Java_com_kulichin_androidplaybilling_AndroidPlayBilling_NativeCompleteQueryPurchases(
+	JNIEnv* Env, 
+	jobject Thiz, 
+	jint ResponseCode,
+	jstring ResponseMessage,
+	jobjectArray Array,
+	jint ArraySize)
+{
+	if (FAndroidPlayBillingModule* Module = FAndroidPlayBillingModule::GetModule())
+	{
+		// Convert java record
+		TArray<FPurchaseRecord> PurchaseRecords = {};
+		for (int Idx = 0; Idx < ArraySize; Idx++)
+		{
+			// Get element from java array
+			auto JPurchaseRecord = NewScopedJavaObject(Env, Env->GetObjectArrayElement(Array, Idx));
+
+			// Construct struct & add to array
+			PurchaseRecords.Add(GetPurchaseRecordStructFromJavaObject(Env, *JPurchaseRecord));
+		}
+
+		Module->TriggerOnQueryPurchasesCompleted
+		(
+			(EBillingResponseCode)ResponseCode,
+			FJavaHelper::FStringFromParam(Env, ResponseMessage),
+			PurchaseRecords
+		);
+	}
+}
+
+#endif
+

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/Public/AndroidPlayBilling.h

+// Copyright (C) 2021. Nikita Klimov. All rights reserved.
+
+#pragma once
+
+#include "AndroidPlayBillingSubsystem.h"
+#include "Engine.h"
+
+#define INITIALIZE_DELEGATE_HANDLER_Base(DelegateClass, DelegateName)	\
+public:																	\
+	DelegateClass DelegateName;											\
+	void Add##DelegateName##_Handle(const DelegateClass& Delegate)		\
+	{																	\
+		ClearAll##DelegateName();										\
+		DelegateName = Delegate;										\
+	}																	\
+	void ClearAll##DelegateName()										\
+	{																	\
+		if(DelegateName.IsBound())										\
+		{																\
+			DelegateName.Clear();										\
+		}																\
+	}
+
+#define INITIALIZE_DELEGATE_HANDLER_TwoParams(															\
+		DelegateClass, DelegateName,																	\
+		FirstParamType, FirstParamName, SecondParamType, SecondParamName)								\
+		INITIALIZE_DELEGATE_HANDLER_Base(DelegateClass, DelegateName)									\
+	void Trigger##DelegateName(FirstParamType FirstParamName, SecondParamType SecondParamName)			\
+	{																									\
+		if (DelegateName.IsBound())																		\
+		{																								\
+			FSimpleDelegateGraphTask::CreateAndDispatchWhenReady(										\
+			FSimpleDelegateGraphTask::FDelegate::CreateLambda([FirstParamName, SecondParamName, this]()	\
+			{																							\
+				DelegateName.Execute(FirstParamName, SecondParamName);									\
+				ClearAll##DelegateName();																\
+			}),																							\
+			TStatId(), nullptr, ENamedThreads::GameThread);												\
+		}																								\
+	}
+
+#define INITIALIZE_DELEGATE_HANDLER_ThreeParams(																				\
+		DelegateClass, DelegateName,																							\
+		FirstParamType, FirstParamName, SecondParamType, SecondParamName, ThirdParamType, ThirdParamName)						\
+		INITIALIZE_DELEGATE_HANDLER_Base(DelegateClass, DelegateName)															\
+	void Trigger##DelegateName(FirstParamType FirstParamName, SecondParamType SecondParamName, ThirdParamType ThirdParamName)	\
+	{																															\
+		if (DelegateName.IsBound())																								\
+		{																														\
+			FSimpleDelegateGraphTask::CreateAndDispatchWhenReady(																\
+			FSimpleDelegateGraphTask::FDelegate::CreateLambda([FirstParamName, SecondParamName, ThirdParamName, this]()			\
+			{																													\
+				DelegateName.Execute(FirstParamName, SecondParamName, ThirdParamName);											\
+				ClearAll##DelegateName();																						\
+			}),																													\
+			TStatId(), nullptr, ENamedThreads::GameThread);																		\
+		}																														\
+	}
+
+class FAndroidPlayBillingModule : public IModuleInterface
+{
+public:
+	virtual void StartupModule() override;
+	virtual void ShutdownModule() override;
+	static FAndroidPlayBillingModule* GetModule();
+
+#if PLATFORM_ANDROID
+	INITIALIZE_DELEGATE_HANDLER_TwoParams(
+		FOnOperationCompleted, OnOperationCompleted,
+		const EBillingResponseCode, ResponseCode,
+		const FString&, ResponseMessage)
+	
+	INITIALIZE_DELEGATE_HANDLER_ThreeParams(
+		FOnLaunchBillingFlowCompleted, OnLaunchBillingFlowCompleted,
+		const EBillingResponseCode, ResponseCode,
+		const FString&, ResponseMessage,
+		const TArray<FPurchaseRecord>&, UpdatedPurchaseRecords);
+	
+	INITIALIZE_DELEGATE_HANDLER_ThreeParams(
+		FOnQueryPurchaseHistoryCompleted, OnQueryPurchaseHistoryCompleted,
+		const EBillingResponseCode, ResponseCode,
+		const FString&, ResponseMessage,
+		const TArray<FPurchaseRecordFromHistory>&, PurchaseRecordsFromHistory);
+	
+	INITIALIZE_DELEGATE_HANDLER_ThreeParams(
+		FOnQuerySkuDetailsCompleted, OnQuerySkuDetailsCompleted,
+		const EBillingResponseCode, ResponseCode,
+		const FString&, ResponseMessage,
+		const TArray<FSkuDetailsRecord>&, SkuDetailsRecords);
+	
+	INITIALIZE_DELEGATE_HANDLER_ThreeParams(
+		FOnQueryPurchasesCompleted, OnQueryPurchasesCompleted,
+		const EBillingResponseCode, ResponseCode,
+		const FString&, ResponseMessage,
+		const TArray<FPurchaseRecord>&, PurchaseRecords);
+#endif
+};

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/Public/AndroidPlayBillingSettings.h

+// Copyright (C) 2021. Nikita Klimov. All rights reserved.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "UObject/NoExportTypes.h"
+#include "AndroidPlayBillingSettings.generated.h"
+
+UCLASS(transient, config = Engine)
+class UAndroidPlayBillingSettings : public UObject
+{
+	GENERATED_BODY()
+
+	UPROPERTY(Config, EditAnywhere, Category = "Android Play Billing")
+	FString BillingLicenseKey;
+
+#if WITH_EDITOR
+	virtual void PostEditChangeProperty(struct FPropertyChangedEvent& PropertyChangedEvent) override;
+#endif
+};

Plugins/AndroidPlayBilling/Source/AndroidPlayBilling/Public/AndroidPlayBillingSubsystem.h

+// Copyright (C) 2021. Nikita Klimov. All rights reserved.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Subsystems/GameInstanceSubsystem.h"
+#include "AndroidPlayBillingSubsystem.generated.h"
+
+UENUM(BlueprintType)
+enum EBillingResponseCode
+{
+	/**
+	 *	Billing API version is not supported for the type requested.
+	 */
+	BILLING_UNAVAILABLE		= 3		UMETA(DisplayName = "BillingUnavailable"),
+
+	/**
+	 *	Invalid arguments provided to the API.
+	 */
+	DEVELOPER_ERROR			= 5		UMETA(DisplayName = "DeveloperError"),
+
+	/**
+	 *	Fatal error during the API action.
+	 */
+	ERROR					= 6		UMETA(DisplayName = "Error"),
+
+	/**
+	 *	Requested feature is not supported by Play Store on the
+	 *	current device.
+	 */
+	FEATURE_NOT_SUPPORTED	= -2	UMETA(DisplayName = "FeatureNotSupported"),
+
+	/**
+	 *	Failure to purchase since item is already owned.
+	 */
+	ITEM_ALREADY_OWNED		= 7		UMETA(DisplayName = "ItemAlreadyOwned"),
+
+	/**
+	 *	Failure to consume since item is not owned.
+	 */
+	ITEM_NOT_OWNED			= 8		UMETA(DisplayName = "ItemNotOwned"),
+
+	/**
+	 *	Requested product is not available for purchase.
+	 */
+	ITEM_UNAVAILABLE		= 4		UMETA(DisplayName = "ItemUnavailable"),
+
+	/**
+	 *	Success.
+	 */
+	OK						= 0		UMETA(DisplayName = "OK"),
+
+	/**
+	 *	Play Store service is not connected now - potentially
+	 *	transient state.
+	 */
+	SERVICE_DISCONNECTED	= -1	UMETA(DisplayName = "ServiceDisconnected"),
+
+	/**
+	 *	The request has reached the maximum timeout before
+	 *	Google Play responds.
+	 */
+	SERVICE_TIMEOUT			= -3	UMETA(DisplayName = "ServiceTimeout"),
+
+	/**
+	 *	Network connection is down.
+	 */
+	SERVICE_UNAVAILABLE		= 2		UMETA(DisplayName = "ServiceUnavailable"),
+
+	/**
+	 *	User pressed back or canceled a dialog.
+	 */
+	USER_CANCELED			= 1		UMETA(DisplayName = "UserCanceled")
+};
+
+UENUM(BlueprintType)
+enum EFeatureType
+{
+	/**
+	 *	Purchase/query for in-app items on VR.
+	 */
+	IN_APP_ITEMS_ON_VR			= 0 UMETA(DisplayName = "InAppPurchaseOnVR"),
+
+	/**
+	 *	Launch a price change confirmation flow.
+	 */
+	PRICE_CHANGE_CONFIRMATION	= 1 UMETA(DisplayName = "PriceChangeConfirmation"),
+
+	/**
+	 *	Purchase/query for subscriptions.
+	 */
+	SUBSCRIPTIONS				= 2 UMETA(DisplayName = "Subcriptions"),
+
+	/**
+	 *	Purchase/query for subscriptions on VR.
+	 */
+	SUBSCRIPTIONS_ON_VR			= 3 UMETA(DisplayName = "SubscriptionsOnVR"),
+
+	/**
+	 *	Subscriptions update/replace.
+	 */
+	SUBSCRIPTIONS_UPDATE		= 4 UMETA(DisplayName = "SubscriptionsUpdate")
+};
+
+UENUM(BlueprintType)
+enum EPurchaseState
+{
+	PENDING				= 2 UMETA(DisplayName = "Pending"),
+	PURCHASED			= 1 UMETA(DisplayName = "Purchased"),
+	UNSPECIFIED_STATE	= 0 UMETA(DisplayName = "UnspecifiedState")
+};
+
+UENUM(BlueprintType)
+enum ESkuType
+{
+	/**
+	 *	A type of SKU for Android apps in-app products.
+	 */
+	INAPP	= 0 UMETA(DisplayName = "InAppProduct"),
+
+	/**
+	 *	A type of SKU for Android apps subscriptions.
+	 */
+	SUBS	= 1 UMETA(DisplayName = "InAppSubscription")
+};
+
+USTRUCT(BlueprintType)
+struct FSkuDetailsRecord
+{
+	GENERATED_BODY()
+	
+	/**
+	 *	Returns a String in JSON format that contains SKU details.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString OriginalJSON;
+	
+	/**
+	 *	Returns the product Id.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString ProductID;
+	
+	/**
+	 *	Returns the of the product.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString Type;
+	
+	/**
+	 *	Returns formatted price of the item, including its currency sign.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString Price;
+	
+	/**
+	 *	Returns price in micro-units, where 1,000,000 micro-units equal
+	 *	one unit of the currency.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	int64 PriceAmountMicros;
+	
+	/**
+	 *	Returns ISO 4217 currency code for price and original price.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString PriceCurrencyCode;
+	
+	/**
+	 *	Returns formatted original price of the item, including its
+	 *	currency sign.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString OriginalPrice;
+	
+	/**
+	 *	Returns the original price in micro-units, where 1,000,000
+	 *	micro-units equal one unit of the currency.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	int64 OriginalPriceAmountMicros;
+	
+	/**
+	 *	Returns the title of the product being sold.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString Title;
+	
+	/**
+	 *	Returns the description of the product.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString Description;
+	
+	/**
+	 *	Subscription period, specified in ISO 8601 format.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString SubscriptionPeriod;
+	
+	/**
+	 *	Trial period configured in Google Play Console, specified in
+	 *	ISO 8601 format.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString FreeTrialPeriod;
+	
+	/**
+	 *	Formatted introductory price of a subscription, including its
+	 *	currency sign, such as €3.99.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString IntroductoryPrice;
+	
+	/**
+	 *	Introductory price in micro-units.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	int64 IntroductoryPriceAmountMicros;
+	
+	/**
+	 *	The billing period of the introductory price, specified in
+	 *	ISO 8601 format.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString IntroductoryPricePeriod;
+	
+	/**
+	 *	The number of subscription billing periods for which the user will
+	 *	be given the introductory price, such as 3.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	int IntroductoryPriceCycles;
+	
+	/**
+	 *	Returns the icon of the product if present.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "SkuDetailsRecord")
+	FString IconURL;
+};
+
+USTRUCT(BlueprintType)
+struct FPurchaseRecordFromHistory
+{
+	GENERATED_BODY()
+	
+	/**
+	 *	Returns the product Id.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecordFromHistory")
+	FString ProductID;
+	
+	/**
+	 *	Returns the time the product was purchased, in milliseconds since
+	 *	the epoch (Jan 1, 1970).
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecordFromHistory")
+	int64 PurchaseTime;
+	
+	/**
+	 *	Returns a token that uniquely identifies a purchase for a given
+	 *	item and user pair.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecordFromHistory")
+	FString PurchaseToken;
+	
+	/**
+	 *	Returns the payload specified when the purchase was acknowledged or
+	 *	consumed.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecordFromHistory")
+	FString DeveloperPayload;
+	
+	/**
+	 *	Returns a String in JSON format that contains details about the
+	 *	purchase order.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecordFromHistory")
+	FString OriginalJSON;
+	
+	/**
+	 *	Returns String containing the signature of the purchase data
+	 *	that was signed with the private key of the developer.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecordFromHistory")
+	FString Signature;
+};
+
+USTRUCT(BlueprintType)
+struct FPurchaseRecord
+{
+	GENERATED_BODY()
+	
+	/**
+	 *	Returns a unique order identifier for the transaction.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString OrderID;
+	
+	/**
+	 *	Returns the application package from which the purchase originated.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString PackageName;
+	
+	/**
+	 *	Returns the product Id.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString ProductID;
+	
+	/**
+	 *	Returns the time the product was purchased, in milliseconds since
+	 *	the epoch (Jan 1, 1970).
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	int64 PurchaseTime;
+	
+	/**
+	 *	Returns a token that uniquely identifies a purchase for a given
+	 *	item and user pair.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString PurchaseToken;
+	
+	/**
+	 *	Returns PurchaseState indicating the state of the purchase.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	TEnumAsByte<EPurchaseState> PurchaseState;
+	
+	/**
+	 *	Returns the payload specified when the purchase was acknowledged or
+	 *	consumed.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString DeveloperPayload;
+	
+	/**
+	 *	Indicates whether the purchase has been acknowledged.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	bool bAcknowledged;
+	
+	/**
+	 *	Indicates whether the subscription renews automatically.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	bool bAutoRenewing;
+	
+	/**
+	 *	Returns a String in JSON format that contains details about the
+	 *	purchase order.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString OriginalJSON;
+	
+	/**
+	 *	Returns String containing the signature of the purchase data that
+	 *	was signed with the private key of the developer.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString Signature;
+	
+	/**
+	 *	The obfuscated account id.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString ObfuscatedAccountID;
+
+	/**
+	 *	The obfuscated profile id.
+	 */
+	UPROPERTY(BlueprintReadOnly, Category = "PurchaseRecord")
+	FString ObfuscatedProfileID;
+};
+
+/**
+ *	Operation delegate
+ */
+DECLARE_DYNAMIC_DELEGATE_TwoParams(
+	FOnOperationCompleted,
+	EBillingResponseCode, ResponseCode,
+	const FString&, ResponseMessage);
+
+/**
+ *	Launch Billing Flow delegate
+ */
+DECLARE_DYNAMIC_DELEGATE_ThreeParams(
+	FOnLaunchBillingFlowCompleted,
+	EBillingResponseCode, ResponseCode,
+	const FString&, ResponseMessage,
+	const TArray<FPurchaseRecord>&, UpdatedPurchaseRecords);
+
+/**
+ *	Query Purchase History delegate
+ */
+DECLARE_DYNAMIC_DELEGATE_ThreeParams(
+	FOnQueryPurchaseHistoryCompleted,
+	EBillingResponseCode, ResponseCode,
+	const FString&, ResponseMessage,
+	const TArray<FPurchaseRecordFromHistory>&, PurchaseRecordsFromHistory);
+
+/**
+ *	Query Sku Details delegate
+ */
+DECLARE_DYNAMIC_DELEGATE_ThreeParams(
+	FOnQuerySkuDetailsCompleted,
+	EBillingResponseCode, ResponseCode,
+	const FString&, ResponseMessage,
+	const TArray<FSkuDetailsRecord>&, SkuDetailsRecords);
+
+/**
+ *	Query Purchase delegate
+ */
+DECLARE_DYNAMIC_DELEGATE_ThreeParams(
+	FOnQueryPurchasesCompleted,
+	EBillingResponseCode, ResponseCode,
+	const FString&, ResponseMessage,
+	const TArray<FPurchaseRecord>&, PurchaseRecords);
+
+// TODO: add examples
+UCLASS()
+class UAndroidPlayBillingSubsystem : public UGameInstanceSubsystem
+{
+	GENERATED_BODY()
+
+public:
+	/**
+	 *	Initiates the billing flow for an in-app purchase or subscription.
+	 *	
+	 *	@param OnOperationResult callback is called when operation has been completed.
+	 *	@param ProductID specifies the ID of the item being purchased.
+	 *	@param ProductType specifies the Type of the item being purchased.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "AndroidPlayBilling")
+	static void LaunchBillingFlow(
+		FOnLaunchBillingFlowCompleted OnOperationResult,
+		const FString& ProductID,
+		const ESkuType ProductType);
+	
+	/**
+	 *	Initiates a flow to confirm the change of price for an item
+	 *	subscribed by the user.
+	 *
+	 *	@param OnOperationResult callback is called when operation has been completed.
+	 *	@param ProductID specifies the ID of the item that has the pending price change. 
+	 *	@param ProductType specifies the Type of the item that has the pending price change.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "AndroidPlayBilling")
+	static void LaunchPriceChangeConfirmationFlow(
+		FOnOperationCompleted OnOperationResult,
+		const FString& ProductID,
+		const ESkuType ProductType);
+	
+	/**
+	 *	Returns purchases details for currently owned items bought
+	 *	within your app.
+	 *
+	 *	@param OnOperationResult callback is called when operation has been completed.
+	 *	@param ProductType the type of the product.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "AndroidPlayBilling")
+	static void QueryPurchases(
+		FOnQueryPurchasesCompleted OnOperationResult,
+		const ESkuType ProductType);
+	
+	/**
+	 *	Performs a network query to get SKU details and return the
+	 *	result asynchronously.
+	 *
+	 *	@param OnOperationResult callback is called when operation has been completed.
+	 *	@param ProductIDs specifies the ProductIDs that are queried for as
+	 *					  published in the Google Developer console.
+	 *					  
+	 *	@param ProductType specifies the Type of the product to query.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "AndroidPlayBilling")
+	static void QuerySkuDetails(
+		FOnQuerySkuDetailsCompleted OnOperationResult,
+		const TArray<FString>& ProductIDs,
+		const ESkuType ProductType);
+	
+	/**
+	 *	Returns the most recent purchase made by the user for each SKU,
+	 *	even if that purchase is expired, canceled, or consumed.
+	 *
+	 *	@param OnOperationResult callback is called when operation has been completed.
+	 *	@param ProductType the type of the product.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "AndroidPlayBilling")
+	static void QueryPurchaseHistory(
+		FOnQueryPurchaseHistoryCompleted OnOperationResult,
+		const ESkuType ProductType);
+	
+	/**
+	 *	Checks if the specified feature or capability is supported
+	 *	by the Play Store.
+	 *
+	 *	@param FeatureType one of the EFeatureType constants.
+	 */
+	UFUNCTION(BlueprintPure, Category = "AndroidPlayBilling")
+	static EBillingResponseCode IsFeatureSupported(const EFeatureType FeatureType);
+	
+	/**
+	 *	Checks if the client is currently connected to the service, so
+	 *	that requests to other methods will succeed.
+	 */
+	UFUNCTION(BlueprintPure, Category = "AndroidPlayBilling")
+	static bool IsIAPInitialized();
+	
+	/**
+	 *	Checks if user owning the product.
+	 *
+	 *	@param ProductID specifies the ID of the item.
+	 */
+	UFUNCTION(BlueprintPure, Category = "AndroidPlayBilling")
+	static bool IsPurchased(const FString& ProductID);
+};

Plugins/HuaweiSDK/Source/HuaweiSDK/HuaweiSDK_UPL.xml

@@ -89,6 +89,15 @@
 
     <buildGradleAdditions>
         <insert>
+            android
+            {
+            compileOptions
+            {
+            targetCompatibility JavaVersion.VERSION_1_8
+            sourceCompatibility JavaVersion.VERSION_1_8
+            }
+            }
+            
             apply plugin: 'com.android.application'
 
             dependencies
@@ -139,6 +148,7 @@
             
             import com.Plugins.HuaweiSDK.activity.ConsumptionActivity;
             import com.Plugins.HuaweiSDK.activity.EntryActivity;
+            import com.Plugins.HuaweiSDK.activity.AccountActivity;
         </insert>
     </gameActivityImportAdditions>
     
@@ -147,10 +157,18 @@
         </insert>
     </gameActivityPostImportAdditions>
 
+    <gameActivityOnCreateAdditions>
+        <insert>
+            mAccountActivity = new AccountActivity(this);
+        </insert>
+    </gameActivityOnCreateAdditions>
+    
     <gameActivityClassAdditions>
         <insert>
             private ConsumptionActivity mConsumptionActivity;
             private EntryActivity mEntryActivity;
+            private AccountActivity mAccountActivity;
+            
             public void AndroidThunkJava_CreateHuaweiIap()
             {
                 mConsumptionActivity = new ConsumptionActivity(this); 
@@ -170,18 +188,19 @@
             {
                 mEntryActivity.Payment(productId);
             }
-        </insert>
-    </gameActivityClassAdditions>
-    
-    <gameActivityOnCreateAdditions>
-        <insert>
             
+            public void AndroidThunkJava_SignIn()
+            {
+                mAccountActivity = new AccountActivity(this);
+                mAccountActivity.signIn();
+            }
         </insert>
-    </gameActivityOnCreateAdditions>
+    </gameActivityClassAdditions>
     
     <gameActivityOnActivityResultAdditions>
         <insert>
             mEntryActivity.onActivityResult(requestCode, resultCode, data);
+            mAccountActivity.onActivityResult(requestCode, resultCode, data);
         </insert>
     </gameActivityOnActivityResultAdditions>
     

Plugins/HuaweiSDK/Source/HuaweiSDK/Private/Android/Java/activity/AccountActivity.java

 package com.Plugins.HuaweiSDK.activity;
 
+import android.app.Activity;
+import android.content.Intent;
 import android.app.Fragment;
 import android.app.FragmentTransaction;
+import android.util.Log;
 
-
+import com.huawei.hmf.tasks.Task;
+import com.huawei.hms.common.ApiException;
 import com.huawei.hms.support.account.AccountAuthManager;
 import com.huawei.hms.support.account.request.AccountAuthParams;
+import com.huawei.hms.support.account.request.AccountAuthParamsHelper;
+import com.huawei.hms.support.account.result.AuthAccount;
 import com.huawei.hms.support.account.service.AccountAuthService;
 
-public class AccountActivity extends activity {
+public class AccountActivity extends Activity {
 
     private String TAG = "HuaweiAccountActivity";
     private AccountAuthService mAuthManager;
@@ -20,13 +26,15 @@ public class AccountActivity extends activity {
         mActivity = activity;
     }
     
-    private void signIn() {
+    public void signIn() {
+        Log.i(TAG, "AccountActivity.signIn");
+        
         mAuthParam = new AccountAuthParamsHelper(AccountAuthParams.DEFAULT_AUTH_REQUEST_PARAM)
                 .setIdToken()
                 .setAccessToken()
                 .createParams();
         mAuthManager = AccountAuthManager.getService(mActivity, mAuthParam);
-        startActivityForResult(mAuthManager.getSignInIntent(), Constant.REQUEST_SIGN_IN_LOGIN);
+        startActivityForResult(mAuthManager.getSignInIntent(), 1002);
     }
     
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
@@ -45,10 +53,10 @@ public class AccountActivity extends activity {
             } else {
                 Log.i(TAG, "signIn failed: " + ((ApiException) authAccountTask.getException()).getStatusCode());
                 
-                nativeSignInResult(false, 0);
+                nativeSignInResult(false, "0");
             }
         }
-        if (requestCode == Constant.REQUEST_SIGN_IN_LOGIN_CODE) {
+        if (requestCode == 1003) {
             //login success
             Task<AuthAccount> authAccountTask = AccountAuthManager.parseAuthResultFromIntent(data);
             if (authAccountTask.isSuccessful()) {

Plugins/HuaweiSDK/Source/HuaweiSDK/Private/Android/Java/activity/EntryActivity.java

@@ -2,7 +2,7 @@ package com.Plugins.HuaweiSDK.activity;
 
 import android.app.Activity;
 import android.content.Intent;
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.text.TextUtils;
 import android.util.Log;
 

Plugins/HuaweiSDK/Source/HuaweiSDK/Private/HuaweiAccount.cpp

@@ -38,8 +38,13 @@ static void ReqSignIn()
 		static jmethodID SignInMethod = FJavaWrapper::FindMethod(Env, FJavaWrapper::GameActivityClassID, "AndroidThunkJava_SignIn", "()V", false);
 		if (SignInMethod)
 		{
+			UE_LOG(LogTemp, Log, TEXT("Find AndroidThunkJava_SignIn"));
 			FJavaWrapper::CallVoidMethod(Env, FJavaWrapper::GameActivityThis, SignInMethod);
 		}
+		else
+		{
+			UE_LOG(LogTemp, Log, TEXT("!Find AndroidThunkJava_SignIn"));
+		}
 	}
 }