According to Sohu's query. Com, the electronic invoice is convenient and fast, and you can apply directly through the invoice assistant in the takeaway app, without asking for it from the merchant. With the popularity of the Internet, the continuous development of take-out platform and food delivery technology, modern take-out has a new form, that is, online ordering, which is a process in which catering enterprises provide food through the Internet platform, users choose food through the platform, pay for it, and catering enterprises deliver food to users.