hash. The most confusing part is this:

送交者: 008 于 2012-04-22, 23:47:18:

回答: Hush Total好像可以晕人由梅子于 2012-04-22, 23:27:08:

引用：

把Invoice No 的30位分成前14位（A）和后14位（B）

other than that I believe the rest part is simple, although I don't know the detail.