Additional guest surcharges?

I'm just trying to navigate this for the first time.

I have a client who wants to charge a surcharge for additional guests. They are listed on Airbnb and Booking.com.

From what I can see the base price (from pricelabs) comes through and then the additional guest surcharge (in OR) for airbnb works fine. But the support article doesn't mention if it works on Booking.com. I'm guessing not.

Then there also seems to be the issue that Airbnb will add a surcharge for guests, but booking.com wants to discount for fewer guests.

The obvious thing to do would be to adjust the booking.com channel increase, but that will affect all of the listings on the Booking.com API not just this one.

My Turkey addled brain keeps telling me there is a solution but can't work it out yet.

Any help gratefully received.

there also seems to be the issue that Airbnb will add a surcharge for guests, but booking.com wants to discount for fewer guests.

Hmm, I'm not aware of that.  According to our support docs, the extra-guest surcharge configured in OwnerRez will be sent up to Booking.com via our API connection with them (once you have that set up), just the same as it does for Airbnb:

https://www.ownerrez.com/support/articles/bookingcom-api-rates-settings 

Thanks for that. Didn’t know that the extra guest fee in OwnerRez pushed through to Booking.com.

All set up now!

btw the other bit was how their systems do surcharges and discounts.