Card Gamification: Category Cards
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Pinduoduo (拼多多)
Social and group shopping
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You can unlock these by buying an item in a category. Each card has Silver, Gold and Diamond levels. Every time you unlock a card, you get different exclusive brand coupons and get upgraded to the next level in that card.
The different category cards are: Maternal and Child Card, Clothing Card, Home Card, Gourmet Card, Electrical Card, Beauty Card, Home Textiles Card, Electronics Card, Sports Card, Mystery Card