Feiyun system supports batch verification of the authenticity of special VAT invoices. The interface connects the national tax ledger and the VAT invoice comprehensive service platform. At present, data and information security has three qualifications. In addition, it also supports a variety of invoice identification and collection methods, which can help finance reduce the workload of manually entering invoice information. At the same time, in the aspect of ticket inspection and authentication of special tickets, tickets can be inspected in batches with one key, and the authentication fee can be deducted only once without logging in. For enterprises with many subsidiaries, they can manage tax numbers and carry out off-site certification deduction.