客人要什么文件？

thank you for your response. please send any documentation that we need to be able to ship this product in the united states. we are based in the u.s. and want to ship this product to customers in the u.s. do you understand? thank you, best regards, scott 这个客人之前问有没有any restrictions of ups, fedex, dhl, ground or air 我说没有，上面就是客人回复了。什么documentation？ 快递的吗？