Marketplace
This one appears to be back,
To check whether you are targeted, on your app go to Play Store menu -> Account -> Rewards
$3 credit towards an app or game over $5
Valid for a $3 credit against any one app, game, or in-app item with an on store price greater than $5 on Google Play.
Use by 20/02/2021
Ah damn, I wasn't targeted…would have been handy for Slay the Spire Android release in Feb!