We have been doing business with you on a cash against documents basis for over a year and would like to Change to payment by 30-day bill of exchange, documents against acceptance.

• 我们以凭文件支付现金的方式和贵公司交易已经超过1年以上，今后希望能变更为收到交货文件后以30天汇票支付的方式支付。