How to gain access to Twitch Prime goodies by linking your Amazon Prime subscription to your Twitch account
1) Navigate to twitchprime.com. From there, sign into your Amazon Prime account by clicking the “Sign In’ link in the top-right corner next to “Already a Prime member”?.
2) You may see a screen asking to confirm your Country. Amazon predetermines this, however, you can change it from the drop-down menu as necessary.
3) If you’re already signed into your Amazon account, you’ll be shown which accounts are being linked and asked to confirm. If not, you will first be asked to log-in to your amazon account.
You’ll then be redirected to the Twitch Prime homepage! Here you can claim all kinds of Twitch Prime goodies.