recurly-js + ajax

recurly-js-ajax.js

$('form').on('submit', function (event) {
  var form = this;
  event.preventDefault();
  recurly.token(form, function (err, token) {
    if (err) {
      // handle error using err.code and err.fields
    } else {
      $.ajax({
        url: '/registrations/something',
        data: {
          'recurly-token': token,
          email: $('#email-input').val(),
          /* etc */
        },
        success: function (response) {
          // the response you send back: successful registration, or failure due to card decline, etc
        }
      });
    }
  });
});