I do not know how but I bought two copies of the same game.

This is a steam key.

I will contact by steam to send KEY

"Dear ....,

Thank you for purchasing your game from Green Man Gaming.

This email is your receipt and contains important information relating to your recent purchase.

ORDER DETAILS:

Email address: .......
Date: 2011-04-05 10:32:47
Order ID: .......
Retailer: Green Man Gaming

Items bought:

1. Just Cause 2 x €

Payment type: SagePay
Original credit value: -0.00 €

Total: x €

All prices stated on the receipt are inclusive of applicable taxes and fees

You can access your account online to see the trade-in value of your games on Green Man Gaming at:
http://www.greenmangaming.com/user/account/

IMPORTANT INFORMATION:

The following information is important for downloading and playing your games:

Just Cause 2:

If you follow these steps you should get your game immediately.

1. Open an account with Steam (click the download url below).
2. Download and install the Steam client.
3. Run the Steam client software and log in with your Steam account details.
4. In the bottom left hand corner of the client is a "+ Add a game..." button. Click it.
5. Select "Activate a product on Steam".
6. Paste in the product activation key (listed below).
7. After a couple of minutes Steam will authenticate the code.
8. Click on "Library". You should see you game in the Library.
9. Click on your game to start downloading it.
   Activation keys:
   xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
   Download URL:
   http://greenmangaming.zendesk.com/entries/388665-how-to-download-a-steam-activated-game

If you follow these steps you should get your game immediately."