This is because the milk tea belongs to the catering service industry, according to the "People's Republic of China *** and the State Invoice Management Measures" provisions, the sale of goods, the provision of services and engage in other business activities of the units and individuals, the external occurrence of business operations to collect money, the recipient should be issued to the payer of the invoice. In the issuance of invoices, it must be done in accordance with the number order to fill out, fill out the items are complete, the contents of the real, clear handwriting, all the joints of a print, the contents of the exact same, and in the invoice and the credit union stamped invoice special seal.