shōu kuǎn mǎ shì diàn jiā shōu qián de mǎ, fù kuǎn mǎ shì nǐ ràng diàn yuán sǎo de mǎ

收款码是店家收钱的码，付款码是你让店员扫的码。

The collection code is for the store to receive money, and the payment code is what you let the clerk scan.