Need to start charging. According to Article 20 of Chapter 4 of the Measures for the Administration of Invoices in People's Republic of China (PRC) (hereinafter referred to as the Measures for the Administration of Invoices), units and individuals who sell goods, provide services and engage in other business activities receive money from outside, and the payee shall issue invoices to the payer. Under special circumstances, the payer will issue an invoice to the payee.