As far as I know, there is this custom, but it is not necessary to give it. After all, people's money is not blown by the wind. When you are familiar with it, say a few auspicious words, one is casual, the other is sincere, and everyone is happy; If you are completely unfamiliar with it on weekdays, most of them will not ask for it. In case people are not ready to give it to you, how embarrassing it is to open your mouth.