买方所付之款项系为一份应于订立后再履行而卖方尚未履行的契约而约付的预付款。
The payment by the buyer was therefore an advance payment for an executory contract which the seller had not performed .
不好意思，我们这里不支持信用证。不过，你可以先预付百分之20的订金。剩余部分等出货后再付。
Embarrassed, our here nonsupport letter of credit. However, you can prepay 20% deposit first. After parts of etc. s of surplus take delivery of goods again pay.
付款方式：合同生效后付30%预付款，款清发货；
Pay term:30% pay after sign the contract, all have payed delivery boiler.
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