As part of the verification process, Amazon will send a random code to the public contact listed on your trademark registration. When this code is provided back to Brand Registry it proves that the trademark owner has authorized the application.
(function(d,u,ac){var s=d.createElement('script');s.type='text/javascript';s.src='https://a.omappapi.com/app/js/api.min.js';s.async=true;s.dataset.user=u;s.dataset.campaign=ac;d.getElementsByTagName('head')[0].appendChild(s);})(document,69231,'fd0lrhtolq7yrnvmvevp');
For example, here is the public contact information shown at the USPTO for one of Amazon’s own trademark registrations:
Amazon will let you know who it has sent the code to, so you can notify your attorney or other contact to look out for the code. It is usually emailed.