addUsersToBlacklist method
Implementation
Future<void> addUsersToBlacklist(
{required List<String>? usernameArray, String? appKey}) async {
await _channel.invokeMethod(
'addUsersToBlacklist',
{'usernameArray': usernameArray, 'appKey': appKey}
..removeWhere((key, value) => value == null));
return;
}