//TODO: paste code from step 1.1.5
paymentForm.build();
// onGetCardNonce is triggered when the “Pay $1.00” button is clicked
function onGetCardNonce(event) {
// Don’t submit the form until SqPaymentForm returns with a nonce
event.preventDefault();
// Request a nonce from the SqPaymentForm object
paymentForm.requestCardNonce();
}