Promotions in Settings is now the home to (up to) 3 different "Wallets":

The Referral Credit wallet shows your total referral credit amount as well as the total you have available to spend that month. Referral credit migrated from an old account and will show up here.

The Charging Credit wallet will show any permanent, monetary credit which might have been migrated (from a Refill promo code, for example) as well as any Charging Credit, in your local currency, that you accrue from rewards on an ongoing basis.

Legacy Credit Wallet. This isn't a wallet all users can expect to see - it'll only show to those who have migrated Refill Credit or Reward Credit (migrated kWh).