Shopping receipts, also known as shopping receipts, refer to the sales vouchers kept by shopping malls or other commercial organizations when consumers shop. Except for a few handwritten receipts, most of them are printed by cash registers. Printing shopping receipts generally includes the following contents: sales company name, contact information, cashier number, bill serial number, cashier number, sales date, commodity name, quantity, unit price, commodity amount, total amount, payment method, paid-in amount, change amount, bill printing time, etc. In China, most shopping receipts can't be used as official invoices, and generally they indicate how long it takes to issue invoices.