It’s not a scam just make sure when you do your reservations it’s online through the Avis app are website. On the website you will see the yellow button click to login with your Amex account. You have to have your amazon account to be able to login from partner sites. That can be done through account settings also your phone has to have location service turn on. I found it best to become and Avis preferred member and linked the Avis and amazon accounts together. Also the same email used on amazon login has to be the same as the one on Avis reservation. You can change the name on car rental after you login to the linked accounts ( like amazon in my name but my husband rented car). I’ve used it 3 times so far saved 30% plus 10% gift cards. My two weekly rental 7 days was $157 full size and the one weekend Friday-Monday was $70.
plz check you email for it to say Avis sent you a gift card for Amazon. They don’t come from amazon.