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)

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

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Gamification

Gamification
Gamification with the translation camera
Card Gamification: Function Cards
Gamification and badges