The realization principle of electronic invoice is similar to electronic signature, which depends on the characteristics of electronic signature (the identity of the signature is identifiable, undeniable and the content of the signature cannot be tampered with). By clicking on the signature attribute of the electronic invoice seal online, we can realize online real-time identification of whether the source of the electronic invoice is credible or forged.

Electronic invoice solves the problem of inconvenient sending, reimbursement and storage of paper invoices in the past, and is a key link in the whole paperless office process of enterprises.