Shop is the place where you purchase items to upgrade your plants and improve your team's power. In this Shop, you can buy Gem, Gold, and Items such as: Arena Ticket, Revival Potion, Mana Potion, HP Potion.
Especially in Shop, you can exchange gPEFI earned from in-game activities into Gem at a general rate. This rate is updated every 30 seconds. Moreover, you can use $PEFI to buy Gem or you can purchase Gem directly via Google Play(with an additonal fee of 30%).