What's Subscription's Auth token?

[mayel]

I am getting the following error and not sure what I did wrong, it seems subscription :auth needs to be "AUTH", but that's not 16 bytes?

** (ArgumentError) Subscription's Auth token is not 16 bytes.
    (web_push_encryption 0.2.3) lib/web_push_encryption/encrypt.ex:132: WebPushEncryption.Encrypt.validate_length/3
    (web_push_encryption 0.2.3) lib/web_push_encryption/encrypt.ex:57: WebPushEncryption.Encrypt.encrypt/3
    (web_push_encryption 0.2.3) lib/web_push_encryption/push.ex:45: WebPushEncryption.Push.send_web_push/4

Let me know what else you need to debug?