Mister's menu is not marked because it is sold very little in China. If you want to buy it, just say so, but if you want vanilla, you have to add three yuan. Mister already has milk, so don't add money to the milk.
The standard formula of caramel macchiato is to add vanilla syrup, and finally add caramel syrup to the milk foam to draw a pattern. If you want to pay for caramel syrup, just let me know, and don't add any money. But personally, I think caramel syrup is not good to drink, and vanilla is a little more fragrant. Caramel macchiato is a sweet coffee drink. Caramel is outside, and you can drink it at the first bite.
The recommended answer said that vanilla needs to be added to caramel. I can only say that he either didn't buy it, or he said caramel macchiato with caramel syrup when he bought it. People thought he needed to add caramel syrup, so he charged three yuan.