In case you reinstall the app or migrate from one device to another within the same platform (either iOS or Android), you may need to restore the purchases you've previously made.
Usually you need just to log into the app with the account which you used when made a purchase.
If it won’t restore, try restoring it manually:
- Open the leftside menu > Subscribe.
- Tap the section Restore Purchases.
- You'll see a message from the App Store or Play Store prompting you to enter the password. When you enter it, your purchases will be restored.