For a Guesty fee to appear in your website quote, set it up on the listing and enable it for the correct channel.
Adding the fee. Add the fee on the listing as an additional fee, the same way you configure a cleaning fee. Then open the fee’s channel-sync panel and make sure the fee is enabled for the Booking Engine API channel. If it is not enabled there, the website quote does not include it.
Fees above a guest count. For a fee that applies only above a certain guest count, the listing’s maximum guest count must allow that number of guests. If the listing’s maximum is set lower than the threshold, the conditional fee cannot be charged online. In that case, you can either make it a flat fee on every stay or handle the charge outside the website.