Updating the number of sats via API

There is a similar topic:

But this is not for getting but for updating.


Our company has a self-made web application to invite staff to our organization.
Our HR staffs use the app and they don’t have the Owner role because the permission is too strong.

When the number of the seat reached the limit, HR staff tell me (as an Owner) and I manually add the seat.
I hope it can be done via API.

I noticed that we can delegate the operation to Billing Managers: