In the meantime you can avoid the use of a third party server and can directly send syslog events to your firewall.
The following command on WLC is everything you need:
logging syslog facility client associate enable
After that configure Palo Alto firewall as syslog server on WLC.
On Palo Alto firewall you should create a Syslog Parse Profile with the following entries:
Basically that's everything you need to get it running.
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