The Gold Drop gives you an initial sum of Gold immediately and a certain number of Daily Gold Claim Rewards. Afterward the initial Gold Reward, you'll need to log into the game every new day cycle to claim the full amount of Gold from your Gold Drop purchase. 

With our exciting new 2.9 update, different types of Gold Drops may now reward a random piece of Gear that is unique to Gold Drops. You'll receive this Gear Reward after the Daily Gold Rewards have been fully claimed!