URL    = "https://b24-ar17wx.bitrix24.by/rest/1/1o2...";
    ChatID = "642";

    UserID = 10;

    Result = OPI_Bitrix24.DeleteUserFromChat(URL, ChatID, UserID);

    URL    = "b24-ar17wx.bitrix24.by";
    Token  = "b529cb66006e9f06006b12e400000001000...";
    ChatID = "644";

    Result = OPI_Bitrix24.DeleteUserFromChat(URL, ChatID, UserID, Token);