[经] payment against documents credit

píng dān fù kuǎn xìn yòng zhuàng ㄆㄧㄥˊ ㄉㄢ ㄈㄨˋ ㄎㄨㄢˇ ㄒㄧㄣˋ ㄩㄥˋ ㄓㄨㄤˋ