    URL     = "https://b24-ar17wx.bitrix24.by/rest/1/av5...";
    FieldID = "259";

    Result = OPI_Bitrix24.DeleteCustomTaskField(URL, FieldID);

    URL     = "b24-ar17wx.bitrix24.by";
    Token   = "a5b00469006e9f06006b12e400000001000...";
    FieldID = "261";

    Result = OPI_Bitrix24.DeleteCustomTaskField(URL, FieldID, Token);