curl -X POST 'https://api.sendforsign.com/api/user' \ 
     -H 'X-Sendforsign-Key: YOUR_API_KEY' \
     -H 'Content-Type: application/json' \
     -d '{ 
          "data": {
				   "action": "list",
				   "clientKey": "YOUR_CLIENT_KEY"
				  }
     }'

	{
       "users": [{
                "createTime": "2023-12-01 12:18:55",
				"changeTime": "2023-12-01 12:18:55",
                "userKey": "USER_KEY", 
				"fullname": "John Johnson",
    		    "email": "john_johnson@mail.com", 
				"customKey": "YOUR_COMBINATION"
		}],
       "code": "200",
       "message": "Users found"
    }