Udate the total value of a booking using API

Hi everyone! I would like to update (using API) de price of a booking during the guest's stay.
My idea was to add add-ons in the booking. But I didn't find this option. It seems I am only able to add add-ons before the booking is confirmed.

Another idea was to edit the booking total value directly. I was trying to do it using this endpoint: https://api.lodgify.com/v1/reservation/booking/{id}
But I was not able to modify the booking price this way.

It would be great if it could be described in the reservation what the added value refers to.

Can anyone give me a hint on how to do this?

Thanks in advance