According to the provisions of Article 22 of the Law on the Protection of Consumers' Rights and Interests, when providing goods or services, business operators shall issue invoices and other purchase vouchers or service documents to consumers in accordance with relevant state regulations or business practices; When consumers ask for service documents such as shopping vouchers or invoices, business operators must issue them. This article stipulates the obligation of business operators to issue purchase vouchers or service documents. Purchase voucher refers to the invoice or other shopping voucher issued by the operator to prove the purchase of the commodity after the consumer purchases the commodity from the operator. Service voucher refers to the invoice or other written evidence that consumers ask for from operators after accepting their services.

When providing services to consumers, business operators shall issue purchase vouchers and service documents to consumers in accordance with relevant state regulations or business practices; When consumers ask for purchase vouchers or service documents, business operators must issue them.