Working my way through search results and found the thread linked below which mentions 'Contact' and entityBrowseRecords2.
Attempting to format the query using xmlmc.AddParam()
xmlmc.AddParam("application", "com.hornbill.core");
xmlmc.AddParam("entity", "Contact");
xmlmc.AddParam("searchFilter", "[ { \"column_name\": \"h_email_1\"" +
", \"column_value\": \"foo@bar.com\"" +
", \"matchType\": \"Exact\" }" +
",{ \"column_name\": \"h_contact_status\"" +
", \"column_value\": \"0\"" +
", \"matchType\": \"Exact\" }]");
xmlmc.AddParam("maxResults", 5);
xmlmc.Invoke("data", "entityBrowseRecords2");