In addition, it is a voluntary behavior of consumers to provide ID card information for merchants. Consumers who have provided ID numbers to businesses do not need to worry too much about the disclosure of personal information. The identity card itself has the function of proving and publicizing citizenship. For example, showing your ID card to prevent false invoicing will generally not cause adverse effects; If it is necessary to provide a copy of the ID card, the provider can indicate on the copy that "this copy is only used for my consumption and invoicing on a certain day of the year" to prevent the risk of abuse of the ID card copy.