求翻译：我给你的合同是出厂价,本来不应该做出口文件给你的,但你是我朋友,所以我做了,如果商检OK,那么所有费用我们公司承担,但如果商检不OK,那么你就要付卖单费,是什么意思？

I give you is the ex-factory price of the contract, export files shouldn't do to you, but you are my friend, so I did, if the inspection OK, so we assume all costs, but if the inspection is not OK, then you will pay selling fees,