This app was mentioned in 2 comments, with an average of 3.50 upvotes
Android App: https://play.google.com/store/apps/details?id=com.PepsiCoConsumer.FLVR
Android
https://play.google.com/store/apps/details?id=com.PepsiCoConsumer.FLVR
Edit: Official website
https://www.dousaflavor.com/