Just redeemed my code and it is quite different to how it used to be done. I did not get an email invoice but on your printed receipt there is a barcode in the Starfield item.
- Go to the AMD Rewards web site (just google that phrase) and login. You obviously need to have or create an account
- Type in the code you want to redeem
- It will provide a link and tell you to download the AMD Product Verification Tool
- Install the tool and it will check you have an AMD qualifying product installed.
- Once it verfies that you do indeed have a qualifying product, it loads the AMD Rewards site and lists the Starfield Premium* reward credit
Note: The game is not released yet, so you will be told you will be told you will be notified of your code closer to release.
I tried redeeming mine on my main PC with a 4080 and an AMD 5900X CPU but it told me I had no qualifying AMD products. I had to redeem the code on the PC where I installed the 7900 XT.
A word of warning for those selling or buying Starfield codes. If you do not have an AMD qualifying product you will not be able to redeem your Starfield code. The seller may have to redeem the code for you and send it to you when AMD release it.
* I see people seeling these codes in the MM, please bear in mind this is the PREMIUM edition with early access you are selling. The cheapest I have seen this selling for is £65 on CD Key sites.