If you're clicking to make a purchase on Steam but nothing happens, it's likely due to the Steam Overlay being disabled.
The Steam Overlay is required for in-game purchases to work properly.
How to Enable the Steam Overlay
Open your Steam Library
Right-click on Stumble Guys and select Properties
In the General tab, check the box for:
✓ "Enable the Steam Overlay while in-game"
After enabling this, restart the game and try the purchase again.
Still Not Working?
If purchases still don’t launch after enabling the overlay:
Restart Steam entirely
Make sure Steam isn’t in Offline Mode
Check for pending updates to the game or Steam itself
If the issue persists, contact Steam Support for further assistance.
Have a lawful day!