ra-example.js

$(function() {
  //callback we must supply to the widget to interact with our server-side code
  //must take 3 parameters: email, fingerprint, and app_code
  //must return a jQuery POST request object  

  var callback = function(email, fingerprint, kickbox_app_code){
    return $.post( "/authenticate", {
      email: email, 
      fingerprint: fingerprint,
      kickbox_app_code: kickbox_app_code,
      dataType: "json",
    });
  }
  
  $('.kickbox-form'){ authenticate: callback });   
});