英语高手，请来帮帮忙，谢谢！

We'型旅ve received your payment of USD4,000. Could you please also enclosed a receipt as the attached, for we don'薯租困数念t know which invoice(s) are paid for by this payment.

We have received the US$4000 you remitted to us. Could you possibly send us a transaction record described in the enclosure so that we can match the amount with the according invoices? Thank you.

We have received your 4000 USD payment. Could you kindly specify this payment, as we can not verify to which receipt it's intended to pay.

We have received your payment of USD4000. As we don't know what the payment is for, could you please send us the receipts, like the attached one, which are the payment for.