Blizzard provides an easy-to-use interface to find out all the transactions made on their platform and the money spent on Overwatch, HotS, and all their games.
Discovering the exact money spent on your Blizzard account is very simple and fast.
Log in on battle.net.
Click on your account name at the top right of the screen and select Account Settings.
Navigate to Transaction History > Orders History; or click directly on this link: https://eu.battle.net/account/management/orders.html
Using this interface, you can find out all the money spent on the Blizzard platform for products such as games, loot boxes, expansions, card packs, monthly subscriptions, and more. The order history is split by region, and your current balance is indicated on the top right.
The purchase history includes all the games available on the Blizzard launcher. At the moment of writing this article, we can check out the money spent on World of Warcraft, Diablo III, Starcraft I and II, Hearthstone, Heroes of the Storm, Overwatch, Warcraft III, Destiny 2, and Call of Duty: Black Ops 4.
Of course, as soon as more games will be added, their complete transaction history will also be available in our account settings.