1. Open the mobile phone WeChat. In the WeChat interface, click on the avatar above.

2. In the personal information interface, click My Invoice at the bottom to search.

3. In My Invoice Header interface, click Add Invoice Header.

4. In the interface of adding invoice header, select the company as the header type, and then fill in the full name and tax number of the company. Fill in other information, and then click the Save button above.

If you are not sure what information to fill in, you can ask the personnel department or financial department of your unit.