The Stronghold Store can be accessed when the player hits Stronghold on the map. The store can also be accessed via other stores too. A list of all the stores can be found on the left side bar.
The currency used in the store is Stratosite. They can be earned through Stronghold battles.
The Stronghold Store offers 6 items each day to be purchased. A new roster of items will be offered after 16 hours. However, instant refreshes of the Stronghold Store can be activated with Stratosites.
Items purchased can be used to upgrade your map and your Garrison as well.