As a precaution, I deleted the credit card information registered at Amazon.com for payment.

二段階認証も突破？ Amazonの不正利用でギフトカードを大量購入される被害相次ぐ(Internet Watch/Impress)
(Has the two-step verification been breached? A series of incidents of fraudulent bulk purchases of gift cards on Amazon)
https://internet.watch.impress.co.jp/docs/yajiuma/1531794.html