Cas 6.3.3 Rest protocol additional params

[Nacho Arcadia]

Hi,

I have integrated the rest protocol modules. According to documentation:

https://apereo.github.io/cas/6.3.x/protocol/REST-Protocol.html

one client may send additional parameters in POST/cas/v1/tickets

username=battags&password=password&additionalParam1=paramvalue

I have tested it, but these parameters are ignored. I thought they would be inserted into UsernamePasswordCredential#customFields, and would be available in my custom AuthenticationHandler.

So, what are those customFields used for?

Looking through Cas code, my guess is this custom field or additional param  functionality is to be written by customizing CAS code o writing a module. Is this right?