How to get the amazon.com access token

[jinzishuai]

Hi, the readme here (https://github.com/jkvor/s3-image-viewer#iam-role-trust-relationship) says to use the ACCESS_TOKEN to obtain the user_id but could you please explain in more details how to get the access token to start with?

I was able to login to the https://developer.amazon.com/ portal but there is no way to find this token.

Also, it seems that I don't really need to do this step of setting the amazon.com user_id since I was able to login my app without it (however, my app has a different problem of not showing images (see #6 please), so it is hard to say for sure).

Thanks a lot