invoices refer to business vouchers issued and collected by all units and individuals in the purchase and sale of commodities, provision or acceptance of services and other business activities, which are the original basis for accounting and the important basis for law enforcement inspection by audit institutions and tax authorities.

a credit card is a credit certificate issued by a commercial bank or a credit card company to a qualified consumer. The form of credit card is a card with the name of issuing bank, expiration date, number, cardholder's name and other contents printed on the front. Consumers with credit cards can go to special commercial service departments for shopping or spending, and then the bank will settle accounts with merchants and cardholders, and cardholders can overdraw within the specified amount.