我们只接受保兑的不可撤销的信用证付款。
We only accept payment by confirmed irrevocable letter of credit.
付款一般是以里程碑为依据的，也就是说，客户只在项目的里程碑成功完成(需经双方认可)时付款。
Payments are typically milestone driven; that is, the client pays only upon the completion of mutually agreed project milestones.
我方只接受信用证付款。
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