1. Paper invoices have been issued, and electronic invoices cannot be issued repeatedly;

2. Pay and recharge through third-party channels such as zfb;

3. Grants are not included in printing electronic invoices;

4. The paid-in invoice has been issued, and it cannot be issued repeatedly in the monthly statement invoice. Electronic invoices are 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 numbers are distributed to merchants with unified national coding and unified anti-counterfeiting technology. The electronic invoices are attached with the signature mechanism of the electronic tax bureau.