【 以下文字转载自 shopping 讨论区 】 发信人: LiuYu (thinker), 信区: shopping 标 题: how important is the invoice? 发信站: BBS 未名空间站 (Sat Jan 26 15:32:31 2008) just wikied it. seems invoice is only a commercial document. And according to my experience, you have to request to obtain one if you buy stuffs online. My question is: how important is the invoice in law? Do I need to request it every time in order to get a confirmation of my purchase? Thank you.