How does invoice code exchange work? How does the holder know that he has won the lottery?

There are two ways to exchange invoices, direct scraping and telephone exchange (including SMS and online exchange). The award setting and winning rate shall be set by the tax authorities. The purpose is to encourage consumers to ask for invoices from merchants! Generally, small prizes can be redeemed directly at the merchant. Grand prizes are generally exchanged at the tax bureau with ID cards and complete invoices, and bonuses exceeding a certain amount are subject to tax.