Hostify provides you the option to put a general markup for the OTA's - Expedia Group, Booking.com and SiteMinder.

In order to do that, you just need to go in the Channels section, then select the desired channel as example Booking.com.
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On the left menu bar, you will have to click the "Pricing" section. Then on the screen will appear the general mark up for all your Hotels in Booking.com. Type the desired amount and click "Save Changes".
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Note: We advise to use this setting maximum two times per day, due to the large  amount requests that will going to be generated and sent to the OTA's API.
Changes will takes a bit of time to update on all of the properties.