You are able to restore your purchases either from the Shop or from the Support menu in your settings.
To restore from the Shop:
1. Tap on the Shop icon at the top left from your Studio.
2. Scroll to the very bottom of the shop and tap on Restore Purchases.
You also have the ability to tap on the preset pack and individually restore packs.
To restore from the Support menu:
1. Tap on the face and then tap on Settings.
2. Tap on Support.
3. Tap on Restore Purchases.