I have 15.00 in my steam wallet, I hit the green button to purchase 300 pizza, the button fades out and nothing happens. Do you guys seriously not want me to throw money at you? Because I will throw all of it at you but you won't let me.
You probably have Steam Overlay turned off. Please check this thread -> http://forums.cardhunter.com/threads/steam-wallet-non-functional.7442/
Well, according to the linked thread, this isn't the first time this has happened. Weird. (Sorry, I've no suggestions besides maaaaaybe contacting Steam. Or searching the Intrawebz?)
Please, send us an email (support@cardhunter.com) with details like what OS version are you using, some PC spec info, screenshots can be useful as well. The team is currently investigating the problem. Also, it's not the first report we have received, but this case (not functioning Steam Wallet) is really hard to track and reproduce. Yeah, it looks like the Steam Wallet is causing a lot of problems since the beginning.