Why do that in the first place when Wix Bookings is a Wix API itself?!
If Wix Bookings worked in backend it would be called Wix Bookings backend like all the other Wix API that have backend capabilities.
https://www.wix.com/corvid/reference/wix-bookings.html
https://support.wix.com/en/corvid-by-wix/wix-bookings-with-corvid