Large catering enterprises pay fixed taxes, so there is no tax loss, and unlike some domestic enterprises, these enterprises do not have the problem of tax evasion. There are usually invoices, and it is not excluded that invoices are not collected in time due to negligence. You can keep the receipt of food and pick it up at other chain stores another day, or they can go to other stores to prepare some (if you insist on invoices), but you have to wait for a while.