1. Turn on the phone first, and then find WeChat on the phone's main interface. After finding WeChat, open the "Me" page on WeChat, and then click the "Card Package" menu item in the page, and then click the "My Ticket" menu item in the opened card package page.

2. Secondly, after entering the "My Voucher" menu item, you can see the list of electronic invoices, and then find the required invoices in it, and then click the required invoices.

3. Then click to enter the required invoice, and you can see some basic information of the electronic invoice. Then find "View Invoice" in the page and click "View Invoice" in the page.

4. Finally, click on the shortcut link of the electronic invoice, and you can see the preview page of the invoice.