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diff --git a/examples/demos/hangman/purchasing/inapp/inapptransaction.h b/examples/demos/hangman/purchasing/inapp/inapptransaction.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 INAPPTRANSACTION_H
+#define INAPPTRANSACTION_H
+
+#include <QtCore/qobject.h>
+#include <QtCore/qsharedpointer.h>
+#include <QDateTime>
+#include <QtQml/qqml.h>
+
+#include "inappproduct.h"
+
+QT_BEGIN_NAMESPACE
+
+class InAppProduct;
+class InAppTransactionPrivate;
+class InAppTransaction: public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(TransactionStatus status READ status CONSTANT)
+    Q_PROPERTY(InAppProduct* product READ product CONSTANT)
+    Q_PROPERTY(QString orderId READ orderId CONSTANT)
+    Q_PROPERTY(FailureReason failureReason READ failureReason CONSTANT)
+    Q_PROPERTY(QString errorString READ errorString CONSTANT)
+    Q_PROPERTY(QDateTime timestamp READ timestamp CONSTANT)
+    QML_NAMED_ELEMENT(Transaction)
+    QML_UNAVAILABLE
+
+public:
+    enum TransactionStatus {
+        Unknown,
+        PurchaseApproved,
+        PurchaseFailed,
+        PurchaseRestored
+    };
+    Q_ENUM(TransactionStatus);
+
+    enum FailureReason {
+        NoFailure,
+        CanceledByUser,
+        ErrorOccurred
+    };
+    Q_ENUM(FailureReason);
+
+    ~InAppTransaction();
+
+    InAppProduct *product() const;
+
+    virtual QString orderId() const;
+    virtual FailureReason failureReason() const;
+    virtual QString errorString() const;
+    virtual QDateTime timestamp() const;
+
+    Q_INVOKABLE virtual void finalize() = 0;
+    Q_INVOKABLE virtual QString platformProperty(const QString &propertyName) const;
+
+    TransactionStatus status() const;
+
+protected:
+    explicit InAppTransaction(TransactionStatus status,
+                               InAppProduct *product,
+                               QObject *parent = nullptr);
+
+private:
+    Q_DISABLE_COPY(InAppTransaction)
+    QSharedPointer<InAppTransactionPrivate> d;
+};
+
+#endif // INAPPTRANSACTION_H