Steam declining my payment

Why won`t you contact customer support?

How do you know it's no reason at all? O.o have you called your bank? Have you used that card recently?

Is the address you provided in the same country as where you are trying to buy from? (i.e. your current location)
(Just putting this here.. in case you didn't know.. and are not in the same country..)

because steaam sucks :)

And so it was just steam screwing up like always.

Have you tried both the browser and the client? The client is known for being stupid sometimes.

It happened to me, too last year.

Turned out that my Bank magically decided to auto-block Steam because of "special amount of payment". I called my bank, told about my situation and it started working again.

Only time I experienced that was in the first couple of hours of the summer sale this year. Their system wasn't holding up well because of the demand, payments were taking ages to go through and I was greeted the BS message that my card had been declined after waiting for the order to process for 5 minutes or so. Happened to others too.

Call up your CC company. Most likely an automated fraud lock was placed on it, and can be removed easily. I run into this about every third time I try to buy from Steam or Sony. A quick call, maybe a call back, and they'll fix you right up, and even stay on the line while you purchase if they think it's likely to happen again. Pretty painless.

Steam doesn't want your money. Your money stinks.

Use paypal...

Make sure your address matches the one your card is tied to. And I mean down to the correct capitalization and abbreviations (if you used any). Steam gave me issues a while ago until I figured out the bank had my address as Street and not St.