while you go first, you still have to maintain some amount of rep on ST or tf2outpost.
you PayPal must be verified
choose sending money to Friends - family (sic!)
in a comment you should write "This is a payment for a virtual Team Fortress 2 item that I already received and no physical shippment was involved. I am confirming that I received the item and everything was fine so therefore, I will not dispute or chargeback this payment under any circumstances. YourSteamIDHere"
When PayPal:
Add me only if you agree with rules.
QIWI would be cheaper (58 keys for 100$)
NOTE: DO NOT POST IN THIS THREAD OTHER THAN RELATED TO AN ACTUAL TRADE OFFER. Spam will be reported according to http://www.steamtrades.com/trade/gCrkO/steamtrades-site-rules and http://www.steamtrades.com/trade/dsHtX/spam-and-suspensions
if something hurts your brain you can contact steamtrades support directly. Have fun guys
TF2 OUTPOST THREAD - http://www.tf2outpost.com/trade/17859382