[in_app_purchase] iOS example using in_app_purchase_ios package

packages/in_app_purchase/in_app_purchase_ios/example/README.md

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+# In App Purchase iOS Example
+
+Demonstrates how to use the In App Purchase iOS (IAP) Plugin.
+
+## Getting Started
+
+### Preparation
+
+There's a significant amount of setup required for testing in app purchases
+successfully, including registering new app IDs and store entries to use for
+testing in App Store Connect. The App Store requires developers to configure 
+an app with in-app items for purchase to call their in-app-purchase APIs. 
+The App Store has extensive documentation on how to do this, and we've also 
+included a high level guide below.
+
+* [In-App Purchase (App Store)](https://developer.apple.com/in-app-purchase/)
+
+### iOS
+
+When using Xcode 12 and iOS 14 or higher you can run the example in the simulator or on a device without 
+having to configure an App in App Store Connect. The example app is set up to use StoreKit Testing configured
+in the `example/ios/Runner/Configuration.storekit` file (as documented in the article [Setting Up StoreKit Testing in Xcode](https://developer.apple.com/documentation/xcode/setting_up_storekit_testing_in_xcode?language=objc)).
+To run the application take the following steps (note that it will only work when running from Xcode):
+
+1. Open the example app with Xcode, `File > Open File` `example/ios/Runner.xcworkspace`;
+
+2. Within Xcode edit the current scheme, `Product > Scheme > Edit Scheme...` (or press `Command + Shift + ,`);
+
+3. Enable StoreKit testing:
+  a. Select the `Run` action;
+  b. Click `Options` in the action settings;
+  c. Select the `Configuration.storekit` for the StoreKit Configuration option.
+
+4. Click the `Close` button to close the scheme editor;
+
+5. Select the device you want to run the example App on;
+
+6. Run the application using `Product > Run` (or hit the run button).
+
+When testing on pre-iOS 14 you can't run the example app on a simulator and you will need to configure an app in App Store Connect. You can do so by following the steps below:
+
+1. Follow ["Workflow for configuring in-app
+   purchases"](https://help.apple.com/app-store-connect/#/devb57be10e7), a
+   detailed guide on all the steps needed to enable IAPs for an app. Complete
+   steps 1 ("Sign a Paid Applications Agreement") and 2 ("Configure in-app
+   purchases").
+
+   For step #2, "Configure in-app purchases in App Store Connect," you'll want
+   to create the following products:
+
+   - A consumable with product ID `consumable`
+   - An upgrade with product ID `upgrade`
+   - An auto-renewing subscription with product ID `subscription_silver`
+   - An non-renewing subscription with product ID `subscription_gold`
+
+2. In XCode, `File > Open File` `example/ios/Runner.xcworkspace`. Update the
+   Bundle ID to match the Bundle ID of the app created in step #1.
+
+3. [Create a Sandbox tester
+   account](https://help.apple.com/app-store-connect/#/dev8b997bee1) to test the
+   in-app purchases with.
+
+4. Use `flutter run` to install the app and test it. Note that you need to test
+   it on a real device instead of a simulator. Next click on one of the products
+   in the example App, this enables the "SANDBOX ACCOUNT" section in the iOS
+   settings. You will now be asked to sign in with your sandbox test account to
+   complete the purchase (no worries you won't be charged). If for some reason
+   you aren't asked to sign-in or the wrong user is listed, go into the iOS
+   settings ("Settings" -> "App Store" -> "SANDBOX ACCOUNT") and update your
+   sandbox account from there. This procedure is explained in great detail in
+   the [Testing In-App Purchases with Sandbox](https://developer.apple.com/documentation/storekit/in-app_purchase/testing_in-app_purchases_with_sandbox?language=objc) article.
+
+
+**Important:** signing into any production service (including iTunes!) with the
+sandbox test account will permanently invalidate it.

packages/in_app_purchase/in_app_purchase_ios/example/integration_test/in_app_purchase_test.dart

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+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// @dart = 2.9
+import 'package:flutter_test/flutter_test.dart';
+import 'package:in_app_purchase_ios/in_app_purchase_ios.dart';
+import 'package:in_app_purchase_platform_interface/in_app_purchase_platform_interface.dart';
+import 'package:integration_test/integration_test.dart';
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  testWidgets('Can create InAppPurchaseAndroid instance',
+      (WidgetTester tester) async {
+    InAppPurchaseIosPlatform.registerPlatform();
+    final InAppPurchasePlatform androidPlatform =
+        InAppPurchasePlatform.instance;
+    expect(androidPlatform, isNotNull);
+  });
+}

packages/in_app_purchase/in_app_purchase_ios/example/ios/Flutter/AppFrameworkInfo.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>8.0</string>
+</dict>
+</plist>

packages/in_app_purchase/in_app_purchase_ios/example/ios/Flutter/Debug.xcconfig

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+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "Generated.xcconfig"

packages/in_app_purchase/in_app_purchase_ios/example/ios/Flutter/Release.xcconfig

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+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "Generated.xcconfig"

packages/in_app_purchase/in_app_purchase_ios/example/ios/Podfile

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+# Uncomment this line to define a global platform for your project
+# platform :ios, '9.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+
+  target 'in_app_purchase_pluginTests' do
+    inherit! :search_paths
+
+    # Matches in_app_purchase test_spec dependency.
+    pod 'OCMock','3.5'
+  end
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+  end
+end