var client = ZAFClient.init();
// Use the Zendesk App Framework (ZAF) .get(visitor) which returns a promise
// This get returns useful information on the chat visitor, but not full user profile
client.get('visitor').then(function(visitorData) {
  console.log('visitor ', visitorData);
  // Grab the data for the request for full user data. Either of these ought to work
  var name = visitorData.visitor.name;
  var email = visitorData.visitor.email;

  // Build the request JSON
  var requestData = {
    url: '/api/v2/search.json?query=type:user ' + email,
    type: 'GET'
  }

  // Send request using ZAF method .request(), which returns a promise with the response
  client.request(requestData).then(function(userData) {
    console.log('userData', userData);
    // Use the data - fill in your UI
  });
});