JD.COM electronic greeting card is a single-purpose commercial prepaid card. Users can use more than one Jingdong E-card at the same time when purchasing goods in JD.COM Mall, but different types of E-cards cannot be superimposed. For example, in an order, JD.COM E-card and JD.COM E-card of 50 yuan with a price of 100 yuan are used at the same time, and the system will automatically choose to use one of them instead of overlapping them.