electronic invoices can be issued in 24 hours. It takes 48 hours from the 1 th to the 6 th of the first month of the month. Electronic invoices can also be reimbursed. According to the provisions of relevant national laws, the drawer and payee can print the format documents of electronic invoices on their own paper, and their legal effect, basic uses and basic use regulations are the same as those of ordinary VAT invoices supervised by tax authorities. The tax number of the electronic invoice is the taxpayer identification number, which is the number on the tax registration certificate. Usually called "tax number".