After you signed up at betfair, you need to make your first deposit. Deposit €10 or more to claim the Welcome Bonus. The Betfair Casino Bonus can be activated without a Bonus Code. To deposit for this Bonus you can use Visa, Visa Debit, Cheque and others. Your Bonus is credited to your account automatically shortly after your initial deposit.
With the Betfair Casino Bonus you can increase your balance by 300%. You get the maximal New Customer Bonus in August 2020 for a deposit of €100. Your balance then amounts €400. If you want to use the Bonus, you can do so until 12/31/2019.
As additional component of the Bonus you get up to 20 Free Spins.