====/igg/cancelteetime====
Cancel an existing teetime reservation. Every golfcourse can set the maximum time/nr of days in advance separately.

parameters:
|auth	|the authorisation code you received from Intogolf BV (mandatory)|
|crsnr	|the id of the course (mandatory)|
|relnr	|the id of the golfer that is currently logged in (mandatory)|
|relkey	|the hash key that was provided upon login (mandatory)|
|fltnr	|id of booking to be changed (mandatory)|


example: https://backend.ikgagolfen.nl/igg/cancelteetime?auth=<your authorisation code>&crsnr=1&relnr=701160&fltnr=3058329

result (if succesful):
<code>{
  "cancelteetime": [
    {
      "errorcode": 0,
      "errormsg": "booking canceled"
    }
  ]
}
</code>
Possible errorcodes are:
|1	|booking not found for this course|
|2	|booking can only be canceled by the owner|
|3	|too late to cancel this booking|
|4	|canceling failed|

if a wrong authorisation code is provided, the backend will return “no authorisation”