Dear Sir/Mam,
If there is any question about last email we sent,please do not hesitate to contact us.
Please noted that the payment will not be made until we've been chosen as purchaser.
Please confirm as soon as possible,we are looking forward to your reply.
Have a nice day.
Regards,
***（写你的称呼）
这是根据我和foreign client 的email 经验,这样写礼貌又不失我方的立场