originalApplicationVersion property
Returns the version number for the version of the application when the user bought the app. Use this for grandfathering users when migrating to subscriptions.
This corresponds to the value of CFBundleVersion (in iOS) in the Info.plist file when the purchase was originally made. This is always null in Android
Implementation
@JsonKey(name: 'originalApplicationVersion')
String? get originalApplicationVersion => throw _privateConstructorUsedError;