Players can make purchases in-game via Steam payment. In order to do so, the Steam Overlay feature must be enabled.

1. Click the 'Steam' button on the top left

2. Go to 'Settings'

3. Click 'In-game'

4. Check 'Enable the Steam Overlay while in-game' and click 'OK'

5. Close the ER:BS client and relaunch the game

6. Please try Overlay shortcut Keys to see if the overlay is working properly. 

7. You will now be able to purchase items in-game!