UP Charge 是什么意思? 急急,谢谢帮助了....

I am hoping because we are making the deliveries sooner this will help you with the currency exchange in china and hopefully can save cost on the .22 upcharge we experienced.。。。这是客人发过来的邮件，我不知UP CHARGE 到 底是什么意思？

好像是小额费用啊..我们也用这个单词..但是我也不确定是什么意思...