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diff --git a/Source/WebCore/Modules/applepay/ApplePaySession.h b/Source/WebCore/Modules/applepay/ApplePaySession.h
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+++ b/Source/WebCore/Modules/applepay/ApplePaySession.h
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+/*
+ * Copyright (C) 2015, 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+ */
+
+#pragma once
+
+#if ENABLE(APPLE_PAY)
+
+#include "ActiveDOMObject.h"
+#include "ApplePayPaymentRequest.h"
+#include "EventTarget.h"
+#include "ExceptionOr.h"
+#include <wtf/Ref.h>
+#include <wtf/RefCounted.h>
+
+namespace JSC {
+class ExecState;
+class JSValue;
+}
+
+namespace WebCore {
+
+class DeferredPromise;
+class Document;
+class Payment;
+class PaymentContact;
+class PaymentCoordinator;
+class PaymentMethod;
+class URL;
+
+struct ApplePayLineItem;
+struct ApplePayPaymentRequest;
+struct ApplePayShippingMethod;
+
+class ApplePaySession final : public RefCounted<ApplePaySession>, public ActiveDOMObject, public EventTargetWithInlineData {
+public:
+    static ExceptionOr<Ref<ApplePaySession>> create(Document&, unsigned version, ApplePayPaymentRequest&&);
+    virtual ~ApplePaySession();
+
+    static const unsigned short STATUS_SUCCESS = 0;
+    static const unsigned short STATUS_FAILURE = 1;
+    static const unsigned short STATUS_INVALID_BILLING_POSTAL_ADDRESS = 2;
+    static const unsigned short STATUS_INVALID_SHIPPING_POSTAL_ADDRESS = 3;
+    static const unsigned short STATUS_INVALID_SHIPPING_CONTACT = 4;
+    static const unsigned short STATUS_PIN_REQUIRED = 5;
+    static const unsigned short STATUS_PIN_INCORRECT = 6;
+    static const unsigned short STATUS_PIN_LOCKOUT = 7;
+
+    static ExceptionOr<bool> supportsVersion(ScriptExecutionContext&, unsigned version);
+    static ExceptionOr<bool> canMakePayments(ScriptExecutionContext&);
+    static ExceptionOr<void> canMakePaymentsWithActiveCard(ScriptExecutionContext&, const String& merchantIdentifier, Ref<DeferredPromise>&&);
+    static ExceptionOr<void> openPaymentSetup(ScriptExecutionContext&, const String& merchantIdentifier, Ref<DeferredPromise>&&);
+
+    ExceptionOr<void> begin();
+    ExceptionOr<void> abort();
+    ExceptionOr<void> completeMerchantValidation(JSC::ExecState&, JSC::JSValue merchantSession);
+    ExceptionOr<void> completeShippingMethodSelection(unsigned short status, ApplePayLineItem&& newTotal, Vector<ApplePayLineItem>&& newLineItems);
+    ExceptionOr<void> completeShippingContactSelection(unsigned short status, Vector<ApplePayShippingMethod>&& newShippingMethods, ApplePayLineItem&& newTotal, Vector<ApplePayLineItem>&& newLineItems);
+    ExceptionOr<void> completePaymentMethodSelection(ApplePayLineItem&& newTotal, Vector<ApplePayLineItem>&& newLineItems);
+    ExceptionOr<void> completePayment(unsigned short status);
+
+    const PaymentRequest& paymentRequest() const { return m_paymentRequest; }
+
+    void validateMerchant(const URL&);
+    void didAuthorizePayment(const Payment&);
+    void didSelectShippingMethod(const PaymentRequest::ShippingMethod&);
+    void didSelectShippingContact(const PaymentContact&);
+    void didSelectPaymentMethod(const PaymentMethod&);
+    void didCancelPayment();
+
+    using RefCounted<ApplePaySession>::ref;
+    using RefCounted<ApplePaySession>::deref;
+
+private:
+    ApplePaySession(Document&, PaymentRequest&&);
+
+    // ActiveDOMObject.
+    const char* activeDOMObjectName() const override;
+    bool canSuspendForDocumentSuspension() const override;
+    void stop() override;
+
+    // EventTargetWithInlineData.
+    EventTargetInterface eventTargetInterface() const override { return ApplePaySessionEventTargetInterfaceType; }
+    ScriptExecutionContext* scriptExecutionContext() const override { return ActiveDOMObject::scriptExecutionContext(); }
+    void refEventTarget() override { ref(); }
+    void derefEventTarget() override { deref(); }
+
+    PaymentCoordinator& paymentCoordinator() const;
+
+    bool canBegin() const;
+    bool canAbort() const;
+    bool canCancel() const;
+    bool canCompleteMerchantValidation() const;
+    bool canCompleteShippingMethodSelection() const;
+    bool canCompleteShippingContactSelection() const;
+    bool canCompletePaymentMethodSelection() const;
+    bool canCompletePayment() const;
+
+    bool isFinalState() const;
+    void didReachFinalState();
+
+    enum class State {
+        Idle,
+
+        Active,
+        ShippingMethodSelected,
+        ShippingContactSelected,
+        PaymentMethodSelected,
+        Authorized,
+        Completed,
+
+        Aborted,
+        Canceled,
+    } m_state { State::Idle };
+
+    enum class MerchantValidationState {
+        Idle,
+        ValidatingMerchant,
+        ValidationComplete,
+    } m_merchantValidationState { MerchantValidationState::Idle };
+
+    const PaymentRequest m_paymentRequest;
+};
+
+}
+
+#endif