You can buy an item at full price OR at a discounted price. To get it at a discount price, you can join in the other people trying to buy the item and finish the purchase or make the payment and then invite a friend to also make the purchase.

After paying, you can invite friends by sharing on WeChat, QQ, QZone, QR code, image or with a voice note. The order isn't shipped to you till the required number of people buy it with you.

More screenshots from‏‏‎ ‎

Pinduoduo (拼多多)

Product screen: Overview
Mini app in WeChat
Home page elements
Numbers
Daily check ins
Card Gamification: Function Cards
Sharing experience
New user experience and onboarding
Top level navigation tabs
Card Gamification: Overview
Card Gamification: Category Cards
App Store Screenshots
Categories
Card Gamification: Behaviour Cards
Profile and more tab
Product screen: Sections

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Payments & Checkout

Buy Premium
Checkout experience
Bank Offers
Rewards Tab