PostID = "438";
    URL    = "https://b24-ar17wx.bitrix24.by/rest/1/f2ppp8uucc891111/";

    Result = OPI_Bitrix24.GetImportantPostViewers(URL, PostID);

    URL   = "b24-ar17wx.bitrix24.by";
    Token = "fe3fa966006e9f06006b12e400000001000...";

    Result = OPI_Bitrix24.GetImportantPostViewers(URL, PostID, Token);