1. First open the Tik Tok APP and select "Three Horizontal Lines".
2. Then click "My Wallet"
3. Click "Shake Coin" again.
4. Click "Invoice" again.
5. Then select the order to be invoiced and click "Go to Invoice".
6. Then fill in the items to be invoiced and click "Confirm Invoicing".
That's it. It's simple. Follow this step.