Subject: [Acme] Final

From: Josh Soref <[email-masked]>
Date: Sat, 18 Feb 2017 22:30:17 -0500

> For final authorizations, the challenges that were used.
> For final orders, the authorizations that were completed.

I have no idea what "final" is, there are only three instances of the
word in the document, this is the other:

> If the final state is "valid", then the server MUST include an "expires" field.

"final state" isn't defined anywhere, just mentioned here.