Initial payment setup

App/App_macOS.swift

@@ -18,6 +18,7 @@ import UserNotifications
 import Combine
 import Defaults
 import CoreKiwix
+import PassKit
 
 #if os(macOS)
 final class AppDelegate: NSObject, NSApplicationDelegate {
@@ -109,6 +110,7 @@ struct RootView: View {
     private let tabCloses = NotificationCenter.default.publisher(for: NSWindow.willCloseNotification)
     /// Close other tabs then the ones received
     private let keepOnlyTabs = NotificationCenter.default.publisher(for: .keepOnlyTabs)
+    private let payment = Payment()
 
     var body: some View {
         NavigationSplitView {
@@ -127,6 +129,21 @@ struct RootView: View {
                     }
                 }
             }
+            .safeAreaInset(edge: .bottom) {
+                if PKPaymentAuthorizationController.canMakePayments(
+                    usingNetworks: Payment.supportedNetworks,
+                    capabilities: Payment.capabilities
+                ) {
+                    PayWithApplePayButton(
+                        .donate,
+                        request: payment.donationRequest(),
+                        onPaymentAuthorizationChange: payment.onPaymentAuthPhase(phase:),
+                        onMerchantSessionRequested: payment.onMerchantSessionUpdate
+                    )
+                    .frame(width: 200, height: 30, alignment: .center)
+                    .padding()
+                }
+            }
             .frame(minWidth: 150)
         } detail: {
             switch navigation.currentItem {

Model/Payment.swift

@@ -0,0 +1,67 @@
+// This file is part of Kiwix for iOS & macOS.
+//
+// Kiwix is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// any later version.
+//
+// Kiwix is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Kiwix; If not, see https://www.gnu.org/licenses/.
+
+import Foundation
+import PassKit
+import SwiftUI
+
+struct Payment {
+
+    static let merchantId = "merchant.org.kiwix"
+    static let supportedNetworks: [PKPaymentNetwork] = [.masterCard, .visa, .discover, .amex, .chinaUnionPay, .electron, .girocard]
+    static let capabilities: PKMerchantCapability = [.threeDSecure, .credit, .debit, .emv]
+
+    func donationRequest() -> PKPaymentRequest {
+        let request = PKPaymentRequest()
+        request.merchantIdentifier = Self.merchantId
+        request.merchantCapabilities = Self.capabilities
+        request.countryCode = "CH"
+        request.currencyCode = "USD"
+        request.supportedNetworks = Self.supportedNetworks
+        request.paymentSummaryItems = [
+            PKPaymentSummaryItem(label: "Kiwix", amount: 15, type: .final)
+        ]
+        return request
+    }
+
+    func onPaymentAuthPhase(phase: PayWithApplePayButtonPaymentAuthorizationPhase) {
+        debugPrint("onPaymentAuthPhase: \(phase)")
+        switch phase {
+        case .willAuthorize:
+            break
+        case .didAuthorize(let payment, let resultHandler):
+//            server.process(with: payment) { serverResult in
+//                guard case .success = serverResult else {
+//                    // handle error
+//                    resultHandler(PKPaymentAuthorizationResult(status: .failure, errors: Error()))
+//                    return
+//                }
+//                // handle success
+//                let result = PKPaymentAuthorizationResult(status: .success, errors: nil)
+//                resultHandler(result)
+//            }
+            break
+        case .didFinish:
+            break
+        @unknown default:
+            break
+        }
+    }
+
+    @available(macOS 13.0, *)
+    func onMerchantSessionUpdate() async -> PKPaymentRequestMerchantSessionUpdate {
+        .init(status: .success, merchantSession: nil)
+    }
+}