I (half) answered my own question from the previous posting.
As a new member to this list, I didn't see my posting up right away.
Have to find out if the moderator likes me.
Anyway, I realized that I should just search this group for any examples
using curl. Guess I should have done that first thing. So, I got my answer:
... assuming my key is 123. But using "...?sig=123..." is the wrong thing to do.
But that still doesn't explain why this example fails:
Don't care too much anymore because I have that "members.json?key=123" example.
Although if you could tell me why that Authorization Bearer line is wrong, then I'll learn something else.