The level of cash back you can receive ranges from 5% for Silver status players, up to 15% for Elite status players. The latter are also eligible to get maximum bonus that can be received, €3000.
The cash back bonus has just a 3x wagering requirement. It can be used on most games. Cadoola Casino [read review] have hundreds of great titles to choose from, including slots and table games.
To claim the cash back bonus, you must contact customer support. You can do this via Email or live chat.