URL    = "https://b24-ar17wx.bitrix24.by/rest/1/ztbe...";
    ChatID = "454";

    Result = OPI_Bitrix24.EnableChatNotifications(URL, ChatID);

    URL    = "b24-ar17wx.bitrix24.by";
    Token  = "c03fa966006e9f06006b12e400000001000...";
    ChatID = "456";

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