Gems or gold or booster purchase can be made by using the in-game shop.
Open in-game shopStep 1: To open in-game shop tap on right top area where you see the count of gold/gems/booster.
Step 2: When the shop opens tap on the green button to buy the item that you want to purchase. This will open the Play Store / App Store purchase screen.
Step 3: Follow the instruction mentioned by Play Store / App Store.
Open in-game shopStep 1: To open in-game shop tap on right top area where you see the count of gold/gems/booster.
Step 2: When the shop opens tap on the green button to buy the item that you want to purchase. This will open the Play Store / App Store purchase screen.
Step 3: Follow the instruction mentioned by Play Store / App Store.