Do anyone frustrated because of the NotAuthorized issue?
1.9.2-p320 :001 > Panda::Profile.all
Panda::APIError: NotAuthorized: Account with access key <<key>> does not exist
If you are setting the PandaStream Add ons through heruku document (https://devcenter.heroku.com/articles/pandastream), Please make sure you create an account in http://www.pandastream.com/ to get you access key and secret key.
NOTE : PandaStream access key and secret key are different from Amazon S3 access key and secret key.