I got an email a few days ago from Amazon suggesting that I should upgrade my code if I was using one of their several payment code examples. I'm assuming this

I got an email a few days ago from Amazon suggesting that I should upgrade my code if I was using one of their several payment code examples. I'm assuming this is in response to some responsible disclosure having happened. Sent me to: https://payments.amazon.com/sdui/sdui/about?nodeId=201033780&mkt_tok=3RkMMJWWfF9wsRojvajMZKXonjHpfsX66ugpXq%2B%2Fhpxrn0V%2Fe%2BDGNkbLjdV4GM9rPb7PRxEFEaBzxQpRAr2UcYFa9ftYHg%3D%3D https://payments.amazon.com/sdui/sdui/about?nodeId=201033780...