尊敬的先生：非常高兴收到贵方的首次订单，货号为BD315。但是，我方不能接受贵方以D/P支付方式付款。首先，我方受金融限制不能扩展信用，对此我方会给客户最有竞争力的价格。其次，由于此次订单数量大，我方只接受信用证支付方式。我方期待贵方早日答复。xxx谨上

尊敬的先生：非常高兴收到贵方的首次订单，货号为BD315。但是，我方不能接受贵方以D/P支付方式付款。首先，我方受金融限制不能扩展信用，对此我方会给客户最有竞争力的价格。其次，由于此次订单数量大，我方只接受信用证支付方式。我方期待贵方早日答复。xxx谨上

Dear Sirs，It is a great pleasure to receive your first order，Article No .BD315. Unfortunately we can not accept the D/P payment .Firstly，we are limited financially to extend our licredit．So we usually offer the most prices to our customers．Secondly， the order between us is so large that we can only accept the L/C payment .We look forward to your early reply .Yours truly，