Chargify - Hosted Page 'Purchase Summary' refresh callback

sample.js

/*
  
  The 'Purchase Summary' section of the hosted page gets periodically updated via Ajax
  when the user:
     1) Loads the page
     2) Validates a Coupon 
     3) Validates a VAT number
     4) Selects billing/shipping state/country (for tax purposes)

   Add this to the 'Custom JavaScript' section of your hosted page settings to respond to this event.

*/

$(document).bind('afterSummaryRefresh', function() {
  alert('foo');
});