英语翻译我已经购买了两个太阳镜,请邮寄至同一收货地址,请退还1笔邮费

i've bought 2 pairs of sunglasses, please ship both of them to the same address and refund the postage of one transaction

I've bought two pairs of sunglasses. Please mail them to the same receiving address and pay back the mail fee.

I have bought two pairs of sunglasses. Please ship them both to the same address and reimburse me the shipping cost of one of them.

I have already bought two sunglasses. please mail them to the same shipping address. please return 1 pen postage.

I have bought two pairs of glasses.
Please mail them to the same adress and pay back half the postage to me.