At present, our company is generally required to purchase a joint authentication system for self-authentication. If there are special circumstances, you can go to the institute for certification.
Originally, you only need to bring a green copy of the input tax and the qualification certificate of the general taxpayer. Do it at the certification window in the lobby. On the spot, it is necessary to tear off the teeth on both sides of the certified joint invoice and give it to the window. After the certification, the window staff will return the green invoice to you, print the certification notice for you and affix the national tax certification seal.