This is an example call for clique_getVoters.
clique_getVoters
{ "jsonrpc": "2.0", "id": "1", "method": "clique_getVoters", "params": [ "latest" ] }
{ "jsonrpc": "2.0", "id": "1", "result": [ "0xed7f2e81b0264177e0df8f275f97fd74fa51a896" ] }