Kiss: billing process: 1. Install Xunuo Finance and Taxation Application Market Software. After installation, you need to insert the computer into the tax tray to register. 2. Click scan code to make out an invoice, maintain the system and connect the printer. 3. When you use it for the first time, add "catering service" to the invoice name and set the tax rate at 6% (3% for small scale). Click Save. 4. Click on the invoice code generation, enter the invoice amount, and print out the QR code receipt to the consumer. When the consumer leaves the store with the receipt, he can issue an invoice at any time by scanning the QR code on the receipt. 5. The invoice opened by the customer with WeChat scan code will be stored in the mobile phone WeChat card package, and the invoice opened with Alipay scan code will be stored in the Alipay card package, and the electronic invoice will also be sent to the mailbox filled by the customer.