1, click the invoice.
Enter PetroChina Youtu APP and click "Invoice" on the homepage.
2. Select an order
Click the order that needs to be invoiced in the page.
Step 3 submit an application
Check the invoice type, enter the relevant billing information, and then click the "Submit Application" button at the bottom.
4. Click OK.
Click "OK" in the billing header interface.
5. Invoice
Click "OK" on the billing prompt page. After the page jumps, you can see the corresponding applied invoice in the interface.