Xbox Live 12 Month Gold Membership
"Buy Xbox Live 12 Month Gold Membership Card and get your Key for Xbox One/360 within minutes via email" (Although for me it took 3 hours)
Shipping - You will get your code (key) by Email
Xbox Live Gold Membership Redemption
Redeem your Membership Card on your Xbox 360/Xbox one Console:
1. Sign into Xbox LIVE.
2. Click the Xbox Guide button located in the center of the controller.
3. Navigate to the Marketplace tab. Select Redeem Code.
4. Enter your 25 digit pre-paid code and enjoy!
Redeem your Membership Card on your computer:
1. From Xbox.com, use your Windows LIVE ID to sign in to your Xbox LIVE account.
2. Select My Account from the My Xbox drop-down menu.
3. Click Redeem Code to enter the pre-paid code for the content that you want to redeem.
4. Follow the instructions that appear on the screen to enter and confirm the redemption on the pre-paid code.
Notes:
Evidently, sometimes the code doesn't work if you already have XBox Gold. ie - you need to allow your membership to expire before redeeming. I'm not sure about this as I didn't have Gold when I applied the code.
Mod Warning: Some users are having issues redeeming in Australia see comments below, buy at your own risk.
That seems dodgy …