1. system upgrade: the bank card system needs to be upgraded regularly to ensure the security, stability and performance of the system. Upgrades include fixing vulnerabilities, adding new features or improving the user experience.

2. Fault repair: the bank card system has a fault or an error, which needs to be maintained and repaired. This includes fixing software or hardware failures, solving network connection problems or handling data errors.

3. Security maintenance: The bank card system is an important system related to the safety of users' property and needs regular maintenance. This includes updating firewalls, encryption technologies and authentication methods to protect users' personal information and financial security.