Documentation can be found following the link below:
https://api.stackexchange.com/docs/top-user-answers-in-tags
public override IBridgeResponseCollection<Answer> GetUserTopAnswers(long id, string[] tags, PostsQuery parameters = null) { IRequestVector[] vectors = new[] { CreateIdVector(id), CreateTagsVector(tags) }; return GetApiResultCollection<Answer, PostsQuery>(ApiMethodEnum.TopUserAnswersInTags, vectors, parameters); }