The value-added service of credit cards means that the issuing bank has added some additional services besides the services provided for cardholders, such as aviation accident insurance, quality services provided by international organizations, overseas emergency rescue services, on-site emergency rescue of automobiles, etc. There are also some high-level credit cards, such as platinum cards, diamond cards, unlimited cards, and high-end value-added services, such as membership of senior clubs and VIP lounge services at airports.