Rework end of game API call + front-end loading

[mikhael28]

At the end of the game, there are two API calls made for each active player - the first updates their profile, with their new achievements and XP. The second, handles the payout from the Stellar blockchain. I would like to rework these two API calls into one, because they are both related to each other and would make error handling easier.

Right now, the Stellar test net transactions sometimes randomly fail - most likely because of whatever technical limitations of the test-net.

I need to have better error-catching for the API calls sent out in the front-end, with better logic to retry - right now, a failing request might break the other request. Perhaps I should rework this into some sort of a 'Loot Box' scenario, where instead of programmatically awarding the Golf Coin, I require somebody to manually 'ask' for the loot - perhaps this is a way I can monetize, by giving people the chance to earn OR buy 'lootboxes' filled with Golf Coins and other goodies.