Create or update bookings.
How to Add/remove bookings from a group booking
You can add or remove a booking from a group booking by using the parameter "masterId" without having to use the action "makeGroup"
To add a booking to a group booking, you set the master id of the group booking in the "masterId" parameter so it would look like this in your request: "masterId": 1234567, that will modify the booking to add it to the group.
To remove a booking from a group booking, you set the "masterId" parameter to null so it will look like this in your request: "masterId": null,
=== DELETE /bookings ===