URL    = FunctionParameters["Bitrix24_URL"];
    UserID = FunctionParameters["Bitrix24_HookUserID"];
    Email  = String(New UUID) + "@exepmple.org";

    // The full structure can be obtained with the function GetUserFieldsStructure

    UserStructure = New Structure;
    UserStructure.Insert("EMAIL"        , Email);
    UserStructure.Insert("UF_DEPARTMENT", 1);

    Result = OPI_Bitrix24.UpdateUser(URL, UserID, UserStructure);

    URL    = FunctionParameters["Bitrix24_Domain"];
    Token  = FunctionParameters["Bitrix24_Token"];
    UserID = FunctionParameters["Bitrix24_UserID"];
    Email  = String(New UUID) + "@exepmple.org";

    UserStructure = New Structure;
    UserStructure.Insert("EMAIL"         , Email);
    UserStructure.Insert("NAME"          , "Oleg");
    UserStructure.Insert("LAST_NAME"     , "Lama");
    UserStructure.Insert("UF_DEPARTMENT" , 7);

    Result = OPI_Bitrix24.UpdateUser(URL, UserID, UserStructure, Token);