Purchasing quantity can not exceed present stock quantity.
Because of transaction limit of Alipay and WeChat, each order amount can not exceed RMB 50,000 and daily payment limit of same payment account can not exceed RMB 50,000.
Program unit price mininum supports the fourth decimal place, but for payment sum while order publishing would be adjusted to the second decimal place.
The order can not be revised at payment process. After 5 mins without paying the order would be deleted automatically.
The "Off-Shelve" programs can not be purchased.
The previous purchaser can not purchase the order again if the publisher appointed new purchaser for previous order.
The donated program can not be purchased again.