collection letter meaning in Chinese

催帐信
收帐费
托收委托书

One form of collection letter is a letter of delinquency .
索款信的一种形式是拖欠债务催告信。
No . for data security and protection , the ird s computer system will cancel an access code which the user has not completed registration within 3 weeks from the date of issue of the collection letter
不可以，基于安全理由，用户如未能在3星期内完成登记使用本服务，有关的启动密码将作废。用户须重新登记才可使用本服务。