With this function you can cancel one whole booking.
Function: cancelbooking
parameters: registrationid, cancelreasonid
Example: https://backend.prowaregolf.nl/api/cancelbooking/key/<your authrisation code here>/registrationid/<registrationid>/cancelreasonid/<cancelreasonid>
result:
{ "cancelbooking":[ { "registrationid":"114", "playingdate":"2015-03-16", "starttime":"13:00:00", "combinationid":"11", "players":[ { "relationid":"1199", "relationcode":"ONDE 1", "relationname":"M. Onderstal", "checkedin":"N", "cancelreasonid":"2" }, { "relationid":"1176", "relationcode":"KERK 1", "relationname":"E.L. Kerkhoven", "checkedin":"N", "cancelreasonid":"2" } ] } ] }