URL    = "https://b24-ar17wx.bitrix24.by/rest/1/yg2...";
    ChatID = "1538";

    Result = OPI_Bitrix24.EnableChatNotifications(URL, ChatID);

    URL    = "b24-ar17wx.bitrix24.by";
    Token  = "91b54d67006e9f06006b12e400000001000...";
    ChatID = "1540";

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