URL = "https://b24-ar17wx.bitrix24.by/rest/1/1o2...";

    FilterStructure = New Structure;
    FilterStructure.Insert("NAME"              , "Vitaly");
    FilterStructure.Insert("LAST_NAME"         , "Alpaca");
    FilterStructure.Insert("WORK_POSITION"     , "DevOps engineer");
    FilterStructure.Insert("UF_DEPARTMENT_NAME", "Marketing department");
    FilterStructure.Insert("USER_TYPE"         , "employee");

    Result = OPI_Bitrix24.FindUsers(URL, FilterStructure);

    URL   = "b24-ar17wx.bitrix24.by";
    Token = "c3abf666006e9f06006b12e400000001000...";

    FilterStructure = New Structure;
    FilterStructure.Insert("UF_DEPARTMENT_NAME", "Bitrix");

    Result = OPI_Bitrix24.FindUsers(URL, FilterStructure, Token);