I modified the code, somewhat, that I found on this page (already cited):
https://devforum.zoom.us/t/help-with-api-create-meeting-with-php/5189/5
I am applying the code to my JWT project. It works on createMeeting, in as much as I get a long, beautiful stdClass Object in the response.
I don’t think I solved the problem in the original post, but I will probably depart from OAuth for now, and build out using the JWT project.
Thanks!
Gregory