In the 1.9 Test Server there is a new tab in the store where you can buy items using the new currency.
The “test store” is divided into three sections, and the currency itself does not yet have a name. We only know that each player gets 700 “coins” to start with. For now, they can only be obtained during special combat missions as part of the public test. Items available for purchase include styles, stickers, emblems, directives, personal reserves, and consumables.