VRBO - collecting extra charges during guest stay.

I always hated this before I was on OwnerRez, and now I need to know how to handle it on OwnerRez using the VRBO API. I have a guest, and she wants to know if she can let her 3 grandkids stay with them for one night tonight. She's upfront and seems willing to accept an extra person charge. Would I just go into the Booking and add the additional charge of $21.25 plus taxes? What about any additional fee(s) for VRBO? How does that get handled? What mistake(s) do I need to not make in doing this?

That's right - with a VRBO API booking, the charges work just like a direct booking. You can go in and change them however you please, and then collect the money under the Transactions tab.

If you enter additional charges above the tax lines, the taxes will automatically recalculate to include them, and be included in the balance due.