1. Login account 12306, and find the corresponding ticket order in "My Order".
2. Enter the order details page and click the "Invoice" button.
3. Fill in the invoice header, taxpayer identification number and other related information, and submit the invoice application.
4. Pay the bill fee, and pay after confirming that the bill information is correct.
5. Waiting for the airline to review the invoice, you can enter the "My Invoice" page by email or follow the official account of WeChat to inquire and download the electronic invoice.
It should be noted that different airlines and platforms may have different operating procedures and charging regulations. You can consult relevant personnel or consult relevant information of official website according to specific conditions.