Gold is earned by playing matches, doing daily challenges and from daily login rewards.
Chest Keys can be obtained by leveling up. They can also be purchased in the application using iTunes and Google Play. There are four options available:
Key Prices:
$0.99 -> 1 Chest Key
$2.99 -> 3 Chest Keys
$10.99 -> 13 Chest Keys
$19.99 -> 28 Chest Keys
How can I get more Chest Keys and Gold?
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It said I must be logged in to purchase. Please help.