STEAM! Let me buy things!

i cant activate a groupees key so id wager steam is having issues :)

I got a lot of unexpected error lately, i think it's a server issue.

For me, rebooting Steam usually fix the problem.

Sounds like the same error I had when trying to make some larger than usual steam purchases via paypal - "An unexpected error has occurred. Your purchase has not been completed." Credit card still worked, though. I assume it's some fraud prevention algorithm on Valve's part, but that's just a guess...

Somewhere I've read you can contact Steam support and (eventually) have your account marked as a big spender, so you don't have to deal with this sort of nonsense. Was afraid to contact them just yet in case some overworked support person pushes the wrong button and locks me out for the duration of the sale. Good luck! :)

STEAM IS DYING PEOPLE!!! DYING I TELL YOU!!!

DESURA IS THE FUTURE!!

That's what you get for being an odd llama. Steam is dying, they need to release Half Life 3, and now. Meanwhile, I say hello to GOG...

Also: Damn steam for taking another 10 bucks off Shadow of Mordor after I bought 4 copies. >:(

I keep getting this today -.-

An unexpected error has occurred. Your purchase has not been completed.
Please contact Steam Support.

Better Google for better results but;

Steam has purchase and activation limits:

around 25 key activations per day

around 10 store purchases per hour

(might be slightly different but there "are" limits)

If you anyway hit those, you get this error, been there. It doesn't need to be bank related or such (but better check). Just let it cool down and remember not to buy/activate in "bulk" next time. And ticket'ing those won't help you loose discount deadline during winter sale...

I asked Steam Support awhile back with the exact same issue, what they told me was to do the following (excerpt from the email):

If using a PC

• Please exit Steam, and navigate to the …Steam directory (by default this is C:Program FilesSteam - if you set a different installation directory, you will need to browse to it).
• Delete all of the files in this folder except: Steam.exe and the Steamapps and Userdata folders
• Restart your computer and test the issue again.

If using a Mac:

• Exit Steam and go to the folder Users/[username]/Library/Application Support/Steam
• Delete all of the files in this folder except for SteamApps and Userdata.
• Restart your computer and test the issue again.

For all operating systems:

• Ensure that you are not using any IP proxy or VPN software. These applications must be completely deactivated when purchasing through Steam.

If the issue still persists, try using a web browser (Internet Explorer 7 or higher on PC, or Safari if on a Mac) to make the purchase using http://store.steampowered.com/
(End excerpt)

This worked rather well with the problem and pretty much fixed it entirely, what it does (I assume) is reinstall all the updates for Steam. Hope this works for you too!
EDIT: Formatting

I got that error in the browser on a new computer; taking my purchase to the client solved the problem for me. After having bought something from the client I was able to buy from the browser.

Are you traveling right now?
If you are in other country than your own, then you will fail to purchase or add funds to your wallet .

I have the exact same problem with PayPal during 'rush hours' on Steam. Direct banking works fine in those situations, so I guess it's a problem between Steam and PayPal, since I can use PayPal just fine 2-3 hours after the new deals are up. Seems like Valve doesn't keep up with server infrastructure vs. user amount that well.

Gabe doesn't love us anymore

Your money is not good enough.

Yup, I bought 2 games during the sale, and both times the check out derped. Yo, Gaben, you have like 1 million dollars, get some more servers and people to fix shit.

Gabe wants a Llama burger, save your life!!!!

Don't kill me Llama