At present, in most cases, many supermarkets invoice with the stub of the small ticket, which contains a detailed list of all the items you bought, and it will reimburse you according to the invoice data pushed by the information on the small ticket.
Many shopping malls now offer free parking services to attract passengers. When you get to the parking lot, you just need to give the invoice to the relevant personnel and you can park for free. This is still practical, and many people can use it.
At present, there are some redemption activities around many shopping malls, all of which are based on small tickets. If you have such a demand, you can buy back some goods with the receipt. After arriving at the service desk, you can also see many activities, that is, there are small tickets and preferential prices.
One of the most common functions of tickets is to check whether their products are consistent with those they bought. Did you say you overspent? Or is there something I forgot to brush? At this time, the receipt is used as a voucher. Because many of them are self-service checkout counters now. That's why the security guards at the door let you out with a receipt for inspection.
In addition, if there is something wrong with the goods you bought, if you want to return them, you must exchange them at the service desk of the supermarket with the receipt. If you don't have a receipt, they generally won't admit that it was sold in their own supermarket, so in this case, you must keep the receipt.
So the receipt in the supermarket is still very useful, so don't throw it away easily. Maybe you will use it somewhere, you can't find it or you are in a hurry. After all, this receipt doesn't need much space, so I'll keep it temporarily for a rainy day.