英语翻译求解！

运费预付 Freight prepaid
运费到付 Freight collect
Our customers required " Freight prepaid".
或者 Our customers can just accept sending the samples with the freight prepaid" 假如是寄样品的话客户要求运费预付可以这样说。

the customer ask us to pay for the fee advance

our client demand that the transportation cost be prepaid by us.

The customer requires us to pay for the freight in advance.