Amazon.com appears in 5% cashback bonus calendar in the 4th quarter this year, which is from October to December 2018. You will need to activate 5% cashback bonus to be able to earn it. When you activate, you will earn 5% cash back at Amazon.com and Wholesale Clubs from 10/1/18 through 12/31/18 on up to $1,500 in purchases. When you reach the cap, you will continue earning 1% cash back on all purchases.
Another good feature of the Discover it® Cash Back card for Amazon customers, is that you can use your cashback bonus automatically at checkout. You can pay for all or just a part of your purchase and the redemption ratio is $1 cashback bonus = $1 to spend at Amazon.com. To pay with cashback bonus, you will need to link your Discover account.