You get a small amount of free cash and unlock the Check In Card by doing so from the home page each day. It doesn't let you check in unless you enable notifications, using this as a way to ask for permissions.

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Pinduoduo (拼多多)

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

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Gamification

Gamification
Card Gamification: Function Cards
Upgrade subscription
Gamification: Badges