[Freeswitch-users] Where can I find the documentation for mod_xml_curl biding=directory api

I want to implement the directory binding using a web service like documented in : https://confluence.freeswitch.org/display/FREESWITCH/mod_xml_curl I'm missing the api documentation that is expected to be implemented by the webservice. On the web I found some old samples but none of them contained the details for the api. Did anyone implement this on their system and can share the api documentation they found? Thanks,