Red stamp pattern on white background. China Unicom official website information shows that the electronic invoices issued by Beijing Unicom, like paper electronic invoices, are all tickets with a white background and a red stamp. In addition, the invoice is printed in black font with code, service name, quantity, unit price and amount. Electronic invoice is the product of the information age. Like ordinary invoices, they are distributed to merchants in the form of unified issuance by the tax bureau. The invoice number is distributed to merchants with national unified coding and unified anti-counterfeiting technology. The signature mechanism of the electronic tax bureau is attached to the electronic invoice.