páiduì jiézhàng shí, kěyǐ tíqián dǎkāi fùkuǎn mǎ huò zhǔnbèi hǎo sǎo mǎ排队结账时,可以提前打开付款码或准备好扫码。While waiting in line to pay, you can open your payment code in advance or get ready to scan.