Do I need an invoice to buy things?

Yes If the product is unqualified, the rights protection depends on the invoice, and the purchase must be invoiced. Operators have the legal obligation to issue invoices to consumers. Invoice refers to the business vouchers issued and collected by all units and individuals in buying and selling goods, providing or receiving services and engaging in other business activities. It is the original basis of accounting, and it is also an important basis for law enforcement inspection by audit institutions and tax authorities.