==== /pwg/Koppeling intogolf ====
Thid function gives you the Proware memberid by relation is he/she has in intogolf. 

parameters:
|itgrelnr|Intogolf relation id|

Important : This function can only be used when Intogolf is leading


Information: When the member can not be found the function returns -9.

Example:
https://backend.prowaregolf.nl/api/getmemberidbyitgrelnr/key/<your authrisation code here>/itgrelnr/<Intogolf relation id>

result:
<code>
{
 "getmemberidbyitgrelnr":[
  {
   "lidnummer":"5"
  }
 ]
}
</code>