[AndrewDavis]

authz may be confusing to non USA English speakers. I wouldn't make the connection without it spelled out to me. Unfortunately I don't have a better suggestion because auths as short for authorisation is probably worse.

[Affric]

If you work with computers (rather than using them) and don't default to USA English when discussing and using them you are likely in for a bad time.

[raxxorraxor]

I think it is less confusion than just calling it auth. I have read many articles about basic auth vs oauth. But the auth here isn't the same.