Quoting amazon.com/code

Sometimes, you might need to verify the credentials that have been submitted. This could be your email address, phone number or any other information that the website requires. These codes can be sent to you via email or text message along with your submitted information as you check out. The verification codes can be sent to you via text message, voice call or through
https://sites.google.com/view/wwwamazonc0mcode/
https://sites.google.com/view/amazon-com-us-code/
https://sites.google.com/view/amazoncomcodee/
https://sites.google.com/view/amazoncomuscodes/