To cashout via Amazon Gift Card, please follow these steps to successfully get and redeem your code:
Open the "Tango card" titled email that was sent to the email address you chose
Copy the the security code from the email
Click on the redemption URL and paste the code you copied there
Click on "Claim code"
Your Amazon Gift Card code will be appear - copy it!
Login to your Amazon account and go to the "Redeem a Gift Card" page by clicking here
Paste the claimed code and click on "Apply to your balance"
Here's a video showing the process quickly: