A Purchase Stamp Card is a Card where you will receive a stamp every time you make a purchase in-game. Note that this feature is available from version 5.8.0.
Where can you find a Purchase Stamp Card?
You can find it under a promo, when you open the Shop, the Seasonal Calendar, your Piggy Bank and the Spin Menu.
How does it work?
You need to get 5 stamps to complete your Purchase Stamp Card. The first stamp is on us! Therefore, you only need 4 stamps to receive the final reward! You will have to complete your Purchase Stamp Card in order to receive 3 Mega Spins for FREE! After claiming your reward, the Stamp Card will disappear.