URL    = "https://b24-ar17wx.bitrix24.by/rest/1/1o2...";
    ChatID = "825";

    Result = OPI_Bitrix24.GetChatUsers(URL, ChatID);

    URL    = "b24-ar17wx.bitrix24.by";
    Token  = "4f33ef66006e9f06006b12e400000001000...";
    ChatID = "827";

    Result = OPI_Bitrix24.GetChatUsers(URL, ChatID, Token);