China's export tax rebate check
http://www.taxrefund.com.cn/cess/

Customs control code queries
http://query.customs.gov.cn/HYW2007DataQuery/Cscx/CscxListView.aspx?tableName=zfs_table_jgzj

Bank of China, real-time exchange rates
http://www.boc.cn/sourcedb/whpj/

Customs commodity code query
http://pfrx.shcus.gov.cn/szjl/szjl.php