您好，此为商务英语邮件内容，翻译如下请参考：
Please find the attached Proforma Invoice. Please sign it and send back after confirmation.
P.S. The extra paid USD $21,637.70 was received, which was responded/informed by the agency.
请注意，PI 即 Proforma Invoice，指形式发票
希望回答对您有所帮助。
Please refer to annex PI, please sign back after checked !
PS: agency has received the extra pay of USD $21637.70 .
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