Documentation can be found following the link below:
https://api.stackexchange.com/docs/unaccepted-questions-on-users
public override IBridgeResponseCollection<Question> GetUsersQuestionsWithNoAcceptedAnswer(long[] ids, PostsQuery parameters = null) { return GetApiResultCollection<Question, PostsQuery>(ApiMethodEnum.UnacceptedQuestionsOnUsers, CreateIdsVector(ids), parameters); }