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diff --git a/examples/demos/hangman/purchasing/android/androidinapppurchasebackend.h b/examples/demos/hangman/purchasing/android/androidinapppurchasebackend.h
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+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef ANDROIDINAPPPURCHASEBACKEND_H
+#define ANDROIDINAPPPURCHASEBACKEND_H
+
+#include <QMutex>
+#include <QSet>
+#include <QDateTime>
+#include <QJniObject>
+#include <QJniEnvironment>
+
+#include "../inapp/inapppurchasebackend.h"
+#include "../inapp/inappproduct.h"
+#include "../inapp/inapptransaction.h"
+
+QT_BEGIN_NAMESPACE
+class AndroidInAppProduct;
+class AndroidInAppPurchaseBackend : public InAppPurchaseBackend
+{
+    Q_OBJECT
+public:
+    explicit AndroidInAppPurchaseBackend(QObject *parent = 0);
+
+    void initialize();
+    bool isReady() const;
+
+    void queryProducts(const QList<Product> &products);
+    void queryProduct(InAppProduct::ProductType productType, const QString &identifier);
+    void restorePurchases();
+
+    void setPlatformProperty(const QString &propertyName, const QString &value);
+
+    void purchaseProduct(AndroidInAppProduct *product);
+
+    void consumeTransaction(const QString &purchaseToken);
+    void registerFinalizedUnlockable(const QString &identifier);
+
+    // Callbacks from Java
+    Q_INVOKABLE void registerProduct(const QString &productId,
+                                     const QString &price,
+                                     const QString &title,
+                                     const QString &description);
+    Q_INVOKABLE void registerPurchased(const QString &identifier,
+                                       const QString &signature,
+                                       const QString &data,
+                                       const QString &purchaseToken,
+                                       const QString &orderId,
+                                       const QDateTime &timestamp);
+    Q_INVOKABLE void purchaseSucceeded(int requestCode,
+                                       const QString &signature,
+                                       const QString &data,
+                                       const QString &purchaseToken,
+                                       const QString &orderId,
+                                       const QDateTime &timestamp);
+    Q_INVOKABLE void purchaseFailed(int requestCode,
+                                    int failureReason,
+                                    const QString &errorString);
+    Q_INVOKABLE void registerReady();
+
+private:
+    void checkFinalizationStatus(InAppProduct *product,
+                                 InAppTransaction::TransactionStatus status = InAppTransaction::PurchaseApproved);
+    bool transactionFinalizedForProduct(InAppProduct *product);
+    void purchaseFailed(InAppProduct *product,
+                        int failureReason,
+                        const QString &errorString);
+
+    struct PurchaseInfo
+    {
+        PurchaseInfo(const QString &signature_, const QString &data_, const QString &purchaseToken_, const QString &orderId_, const QDateTime &timestamp_)
+            : signature(signature_)
+            , data(data_)
+            , purchaseToken(purchaseToken_)
+            , orderId(orderId_)
+            , timestamp(timestamp_)
+        {
+        }
+
+        QString signature;
+        QString data;
+        QString purchaseToken;
+        QString orderId;
+        QDateTime timestamp;
+    };
+
+    mutable QRecursiveMutex m_mutex;
+    bool m_isReady;
+    QList<QString> purchasedUnlockebles;
+    QJniObject m_javaObject;
+    QScopedPointer<AndroidInAppPurchaseBackend> d;
+    QHash<QString, InAppProduct::ProductType> m_productTypeForPendingId;
+    QHash<QString, PurchaseInfo> m_infoForPurchase;
+    QHash<int, InAppProduct *> m_activePurchaseRequests;
+};
+QT_END_NAMESPACE
+
+#endif // ANDROIDINAPPPURCHASEBACKEND_H