hej aurélien, list, as hoped for i got it to work with the current org-element.el with only few changes to org-sync. i pushed my changes to my github at [1]. please feel free to comment and/or merge.
the commit bdcbae os-github: use authentication data also for os-github-fetch-json-page is optional and i wouldn't mind moving that to a separate feature branch if you prefer. cheers, jonas Footnotes: [1] https://github.com/coroa/org-sync.git https://github.com/coroa/org-sync