Repository: flutter
Issue: [in_app_purchase] completePurchase docs say that it throws PurchaseException, which does not seem to exist
Labels: d: api docs,p: in_app_purchase,package,team-ecosystem,P2,triaged-ecosystem

Using in_app_purchase 3.1.1 in Flutter 3.3.9.

The [docs for InAppPurchase.completePurchase](https://pub.dev/documentation/in_app_purchase/latest/in_app_purchase/InAppPurchase/completePurchase.html) say that this method will throw a `PurchaseException` with a `PurchaseException.errorCode` that will allow me to determine the right course of action. However, `PurchaseException` is not a link in the docs, and I can not find it defined anywhere. There is `InAppPurchaseException` which has a `code` property which is simply a string, with no documentation on possible values or their meaning.

Can someone please point me to accurate information on how to catch and handle errors from `InAppPurchase.completePurchase`?





Flutter doctor output:

```

[✓] Flutter (Channel stable, 3.3.9, on macOS 13.1 22C65 darwin-arm, locale en-US)
    • Flutter version 3.3.9 on channel stable at /Users/sharding/Source/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision b8f7f1f986 (8 weeks ago), 2022-11-23 06:43:51 +0900
    • Engine revision 8f2221fbef
    • Dart version 2.18.5
    • DevTools version 2.15.0

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Users/sharding/Library/Android/sdk
    • Platform android-33, build-tools 31.0.0
    • ANDROID_HOME = /Users/sharding/Library/Android/sdk
    • ANDROID_SDK_ROOT = /Users/sharding/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 14C18
    • CocoaPods version 1.11.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)

[✓] VS Code (version 1.74.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.56.0

[✓] Connected device (3 available)
    • iPhone SE (3rd generation) (mobile) • A36C4EE8-7A53-4802-B582-ADEDB4BE36B4 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-15-5 (simulator)
    • macOS (desktop)                     • macos                                • darwin-arm64   • macOS 13.1 22C65 darwin-arm
    • Chrome (web)                        • chrome                               • web-javascript • Google Chrome 109.0.5414.87

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

```