All eligible and newly created ad accounts via The Next Ad Suite can receive a Google bonus of up to €400 credits. Credits will be added to your account as you start spending in your campaigns. You have until 60 days to claim the full €400. Addition of the bonus will be automatically.
However, it will not reflect in your wallet balance, as it's not money you will own or be able to refund. You will be able to see it in the spend of your campaigns as they will start spending more than the money available in your balance/wallet.