Tānzhǔ kěnéng hěn máng, nǐ zìjǐ shūrù jīn'é shí gèng yào quèrèn, bìmiǎn fù cuò

摊主可能很忙，你自己输入金额时更要确认，避免付错。

The vendor might be busy, so double-check when entering the amount yourself to avoid paying the wrong sum.