Official website : https://store.steampowered.com/
Supported games :
- DOTA 2
- PLAYERUNKNOWN’S BATTLEGROUNDS
- Counter-Strike: Global Offensive
The Steam Wallet is a feature Valve has implemented into their Steam content delivery system for the purpose of micro-transactions. It can be used to buy games in store.steampowered.com , and also can be used to buy cosmetics on steamcommunity.com/market , or to make in game purchase for all games played in steam.