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diff --git a/dom/webidl/PaymentRequest.webidl b/dom/webidl/PaymentRequest.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://w3c.github.io/payment-request/#paymentrequest-interface
+ *   https://w3c.github.io/payment-request/#idl-index
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary PaymentMethodData {
+  required DOMString           supportedMethods;
+           object              data;
+};
+
+dictionary PaymentCurrencyAmount {
+  required DOMString currency;
+  required DOMString value;
+};
+
+dictionary PaymentItem {
+  required DOMString             label;
+  required PaymentCurrencyAmount amount;
+           boolean               pending = false;
+};
+
+dictionary PaymentShippingOption {
+  required DOMString             id;
+  required DOMString             label;
+  required PaymentCurrencyAmount amount;
+           boolean               selected = false;
+};
+
+dictionary PaymentDetailsModifier {
+  required DOMString             supportedMethods;
+           PaymentItem           total;
+           sequence<PaymentItem> additionalDisplayItems;
+           object                data;
+};
+
+dictionary PaymentDetailsBase {
+  sequence<PaymentItem>            displayItems;
+  sequence<PaymentShippingOption>  shippingOptions;
+  sequence<PaymentDetailsModifier> modifiers;
+};
+
+dictionary PaymentDetailsInit : PaymentDetailsBase {
+           DOMString   id;
+  required PaymentItem total;
+};
+
+[GenerateInitFromJSON, GenerateToJSON]
+dictionary AddressErrors {
+  DOMString addressLine;
+  DOMString city;
+  DOMString country;
+  DOMString dependentLocality;
+  DOMString organization;
+  DOMString phone;
+  DOMString postalCode;
+  DOMString recipient;
+  DOMString region;
+  DOMString regionCode;
+  DOMString sortingCode;
+};
+
+dictionary PaymentValidationErrors {
+  PayerErrors payer;
+  AddressErrors shippingAddress;
+  DOMString error;
+  object paymentMethod;
+};
+
+[GenerateInitFromJSON, GenerateToJSON]
+dictionary PayerErrors {
+  DOMString email;
+  DOMString name;
+  DOMString phone;
+};
+
+dictionary PaymentDetailsUpdate : PaymentDetailsBase {
+  DOMString     error;
+  AddressErrors shippingAddressErrors;
+  PayerErrors payerErrors;
+  object paymentMethodErrors;
+  PaymentItem   total;
+};
+
+enum PaymentShippingType {
+  "shipping",
+  "delivery",
+  "pickup"
+};
+
+dictionary PaymentOptions {
+  boolean             requestPayerName = false;
+  boolean             requestPayerEmail = false;
+  boolean             requestPayerPhone = false;
+  boolean             requestShipping = false;
+  boolean             requestBillingAddress = false;
+  PaymentShippingType shippingType = "shipping";
+};
+
+[SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled",
+ Exposed=Window]
+interface PaymentRequest : EventTarget {
+  [Throws]
+  constructor(sequence<PaymentMethodData> methodData,
+              PaymentDetailsInit details,
+              optional PaymentOptions options = {});
+
+  [NewObject]
+  Promise<PaymentResponse> show(optional Promise<PaymentDetailsUpdate> detailsPromise);
+  [NewObject]
+  Promise<undefined>       abort();
+  [NewObject]
+  Promise<boolean>         canMakePayment();
+
+  readonly attribute DOMString            id;
+  readonly attribute PaymentAddress?      shippingAddress;
+  readonly attribute DOMString?           shippingOption;
+  readonly attribute PaymentShippingType? shippingType;
+
+           attribute EventHandler         onmerchantvalidation;
+           attribute EventHandler         onshippingaddresschange;
+           attribute EventHandler         onshippingoptionchange;
+           attribute EventHandler         onpaymentmethodchange;
+};