it's an electronic invoice, which is easy to open.

Electronic catering tickets are electronic invoices, replacing traditional paper invoices, which fundamentally solve the problems of cumbersome ticket collection, high delivery cost and paper waste. Stores do not need to be equipped with computers and invoice printers, and they can quickly issue electronic invoices to customers by operating them on their mobile phones.

invoices refer to receipts and payments issued and collected in the course of buying and selling commodities, providing or receiving services and engaging in other business activities.