Analytics

• Device information (name, OS, device ID, screen resolution, device type (mobile, desktop))
• Start/foreground/background time (MacOS, Android, iOS)
• User id
• Crashes (Windows, iOS, Android)
• Push notification tracking (iOS, Android) (NOTE: on Android disabled completely for China version)
• Revenue Tracking
• Application user properties (active_features, joined_groups, etc).
• Events of application usage (Purchases, etc)

• HTTP requests
• Crashes
• Start time
• Session duration
• Device information (name, OS, device ID, screen resolution, network name)

Infrastructure

• Coarse location. The IP address is collected and mapped to a coarse geographic location.
• Technical device information (for example, OS, device type, language, Wi-Fi status, screen size, etc.) or network information (for example, IP address, HTTP user agent).
• Register and purchase events

• We store all of our data here. It is encrypted in transit and at rest
  • user data:
    • email
    • name
    • study stage
    • study year
    • study topic
    • registration date
    • geolocation(country, city, latitude, longitude)
    • preferred locale
    • avatar
    • list of transactions(date and time, transaction id, amount)
    • user organization(for some of customers)
    • user address, biography (for content authors)
    • device information (identifier, OS version)
  • analytics
  • user generated content
    • content progress (lecture, quiz etc)

Payments

• we collect data, but do not store
  • address
  • card details
  • currency
• passing data above to Stripe
• store in DB:
  • transaction details

• store in DB:
  • transaction details

• store in DB:
  • transaction details

• store in DB:
  • purchase receipts
  • purchase history
  • receipt

• store in DB:
  • purchase history
  • receipt

• store in DB:
  • purchase history
  • token