Hey @ludo,
I see! Use our billing endpoints to update the respective billing plan:
https://marketplace.zoom.us/docs/api-reference/zoom-api/billing/accountplancreate
https://marketplace.zoom.us/docs/api-reference/zoom-api/billing/accountplanbaseupdate
https://marketplace.zoom.us/docs/api-reference/zoom-api/billing/accountplanaddonupdate
Thanks,
Tommy