Stripe response handler with conditional assignment

stripe_conditional_response_handler.js

$(document).ready(function() {
  $("#payment-form").submit(function(event) {
    // disable the submit button to prevent repeated clicks
    $('.submit-button').attr("disabled", "disabled");
 
    Stripe.createToken({
        number: $('.card-number').val(),
        cvc: $('.card-cvc').val(),
        exp_month: $('.card-expiry-month').val() || "0",
        exp_year: $('.card-expiry-year').val() || "0"
    }, stripeResponseHandler);
 
    // prevent the form from submitting with the default action
    return false;
  });
});