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)

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

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Card Gamification: Behaviour Cards
Card Gamification: Function Cards
Gamification: Streak, Lives and Gems
Gamification: Badges