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)

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

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Card Gamification: Behaviour Cards
Gamification: Streak, Lives and Gems
Gamification: Badges
Competitions and gamification