var data = participants.getBookingData();
var url = window.location.origin + '/content/themes/mypage/templates-my-pages/template-book-course/send-booking.php' + window.location.search;

$.ajax({
  data: { data: data },
  dataType: 'json',
  type: 'POST',
  url: url
})
  .success(function(response) {
    console.log(response);
  }
  .error(function(err) {
    console.log(error);
  })
);