We are eating in a hotel, and my friend wants a receipt?

1. Invoice is the legal proof of consumption. There are problems that can be used to claim compensation (such as finding that the food you eat has quality problems).

2. Invoice is the proof of reimbursement.

According to the relevant tax laws, hotels must issue invoices to consumers, which is their obligation, not to mention any disadvantages. On the contrary, not invoicing is an act of tax evasion.