Amex offer 입니다

Amex Amazon Business 카드를 contactless 또는 Digital Wallet 으로 5번 사용시, $20-$30 Back, 10/14까지

Earn a $20 or $30 statement credit after using your enrolled Amazon Business American Express Card to pay 5 times via contactless feature or through a select digital wallet by 10/14/20.

Update: Most people got $20 offer, not $30.

https://www.doctorofcredit.com/american-express-amazon-business-card-get-30-when-using-digital-wallet-or-contactless-payments