selfPopulateExtraProperties method
Implementation
Future<void> selfPopulateExtraProperties(HashMap<String, String> uniExtraProperties) async {
//Consulting product manager, the user opt out will only be calculated by what the user selected in their operating system definitions. Not by publisher.
uniExtraProperties[TBLPropertiesUtils.USER_OPT_OUT_KEY] =
(await TBLSdkPlugin.isUserOptOut()).toString();
}