First let me say that this feature is awesome. Just what i was looking for.
I think I found a bug though.
When I uncheck the "Hide Me" feature of the addon (for Analytics) It will fail to authenticate when I try to refund a transaction. The chrome console error points to that you are trying to get the UA-id from the HideMe element and when it is not there it fails.
Cheers and thanks again for a great feature!
Customer support service by UserEcho