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.
我们只接受见装运单据付款的不可撤销信用证。
We only accept payment by irrevocable letter of credit payable against shipping documents.
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