Hello, dear. Tax ukey catering invoicing 1, download VAT invoice invoicing software; 2. Insert the tax key and log in to the VAT invoice issuing software. 3. Click System Maintenance, System Parameter Setting and Parameter Setting, and fill in the basic information of the enterprise; 4. After the electronic tax bureau issues the invoice, it needs to issue the invoice online in the invoicing software; 5. Invoice name needs to be added after invoice distribution; 6. After the product name is added, coding is required; 7. After filling in the invoice information, click Delivery.