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)

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

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Gamification

Card Gamification: Category Cards
Gamification and badges
Card Gamification: Behaviour Cards
Gamification