1. Customized goods: Consumers need customized goods, and merchants will ask consumers to pay the full amount in advance. Customized goods require merchants to purchase raw materials in advance and make molds, which takes a certain cost and time.

2, special services: consumers need special services, such as travel, wedding and other services, businesses will require consumers to pay in advance. These services need to be arranged and prepared in advance, and businesses need to ensure consumers' ability to pay and integrity.

3. High-value goods: The price of goods purchased by consumers is higher, and merchants will ask consumers to pay in advance. Merchants need to ensure consumers' ability to pay and integrity, and avoid problems such as default or return after delivery.