Hello, according to your question, I found that the ordinary invoice has no check code: 1, and log in to "People's Republic of China (PRC) State Taxation Administration of The People's Republic of China National VAT Invoice Inspection Platform"; 2. Finally, fill in the relevant information of the invoice. 1. If the invoice verification information entered by the taxpayer is consistent with the electronic information of the tax authorities, the relevant invoice details will be displayed (if the invoice has been voided by the issuer, the "Voided" logo will be displayed in the inspection results). 2. If there is at least one inconsistency between the invoice verification information entered by the taxpayer and the electronic information of the tax authorities, the inconsistent result information will be displayed. 3. If the invoice verification information entered by the taxpayer cannot be found in the electronic information of the tax authorities, the result information that the ticket cannot be found will be displayed.