付款信是指买方在收到所订货物后，将收货情况、付款方式及金额及时通知卖方。有时候买方因某种原因无法及时付款，也可以写信给卖方要求延期付款，而卖方则根据具体情况同意或拒绝。

　　实例：

　　Subject: Bank Draft Payment

　　Dear Sirs,

　　The goods under Contract No.555 was delivered here in good order and condition and we are quite satisfied with it.

　　Please find a Bank Draft to the value of US$ 80,000 for payment of your Invoice No. 1223 sent by airmail. An acknowledgement in due course will be appreciated.

　　Yours truly,

　　Xxxx

　　主题：汇票付款

　　亲爱的先生;

　　第555号合同项下的货物完好的运抵我处，我们对货物甚感满意。

　　现寄去面额80000美元的银行汇票一张，以结清贵方航邮来的第1223号发票账款，请查收。 如若及时给我方收讫通知，将不胜感激。

　　你忠实的xxxx

　　实例二：

　　Subject: Asking for Deferred Payment

　　Dear Sirs,

　　Your Invoice No.1223 for US $ 80,000 worth of goods supplied on 20th July is due for payment at the end of this month. Most unfortunately, a fire broke out in our warehouse last week and destroyed a certain part of valuable consignment. Our claim is now with the insurance company, but it is unlikely to be met for another three or four weeks and until then we are faced with a difficult financial situation. I am therefore writing for permission to defer payment of your invoice until the end of September.

　　As you know, my accounts with you have always been settled promptly and it is with the utmost regret that I am now forced to make this request. I hope, however, that you will find it possible to grant it. In doing so you would render me a service I should never forget.

　　Yours faithfully,

　　xxxx

　　主题：要求延期付款

　　亲爱的先生：

　　贵方7月20日所供第1223 号发票项下货物之款项80000 美元定于本月底结付。非常不幸，上星期我方仓库发生火灾，毁坏了一部分贵重货物。我们现在正向保险公司提出索赔，但在三四个星期之内，不可能会给予赔偿。在此之前，我方财务形势严峻，故此我们写信请求贵方同意我们推迟到9月底付款。

　　贵方知道我们一向能迅速与贵方结帐。这次我们被迫向贵方提出这个要求，实在抱歉。

　　我们希望贵方能同意这个要求。若是如此，我们将永远记住贵方给予的帮助。

　　你真诚的xxx

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