1. You can't buy the catering invoice, but only ask the catering store to open it after consumption.

2. The catering invoice is a special invoice for the catering industry. Invoice refers to the written proof of receipt and payment provided by all units and individuals in the purchase and sale of goods, provision of labor services or acceptance of labor services and other business activities. It is the legal certificate of financial revenue and expenditure, the original basis of accounting, and an important basis for law enforcement inspection by audit institutions and tax authorities.

3. If the prize money of the catering invoice is less than 511, you can redeem it directly at the invoice receiving place, and if it is more than 511, you need to go to the local tax authorities to redeem it. Usually, it is stated on the back of the invoice.