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

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Card Gamification: Behaviour Cards
Redeeming reward
Gamification and badges