Добавление дополнительных полей

<form name="checkout" method="post" class="checkout course-checkout" action="<?php echo esc_url( $get_checkout_url ); ?>">
    <div class="threecol column">
    <?php   
    $GLOBALS['query']->the_post();
    get_template_part('loop', $item->post_type);
    ?>
    </div>
    <?php if ( sizeof( $woocommerce_checkout->checkout_fields ) > 0 ) : ?>
        <?php do_action( 'woocommerce_checkout_before_customer_details'); ?>
        <div class="fourcol column" class="order_details" id="customer_details">
            <?php $woocommerce->show_messages(); ?>
            <?php do_action('woocommerce_checkout_billing'); ?>
            <?php do_action( 'woocommerce_review_order_before_submit' ); ?>
            <?php if (woocommerce_get_page_id('terms')>0) : ?>
            <p class="form-row terms">
                <input type="checkbox" class="input-checkbox" name="terms" <?php if (isset($_POST['terms'])) echo 'checked="checked"'; ?> id="terms" />
                <label for="terms" class="checkbox"><?php _e('I accept the', 'academy'); ?> <a href="<?php echo esc_url( get_permalink(woocommerce_get_page_id('terms')) ); ?>" target="_blank"><?php _e('terms &amp; conditions', 'academy'); ?></a></label>
            </p>
            <?php endif; ?>
            <div class="formatted-form">
                <?php do_action('woocommerce_before_order_notes', $checkout); ?>
                <?php do_action('woocommerce_after_order_notes', $checkout); ?>
            </div>
            <?php if ( $checkout->enable_guest_checkout ) : ?>
            <input id="createaccount" type="hidden" name="createaccount" value="1" />
            <?php endif; ?>
            <input id="shiptobilling-checkbox" type="hidden" name="shiptobilling" value="1" />  
            <input id="createaccount" type="hidden" name="createaccount" value="1">
            <input type="hidden" name="register_url" value="<?php echo ThemexUser::$data['register_page_url']; ?>" />
            <?php do_action( 'woocommerce_review_order_after_submit' ); ?>
        </div>
        <?php do_action( 'woocommerce_checkout_after_customer_details'); ?>     
    <?php endif; ?>
    <div class="fivecol column last">
        <?php do_action('woocommerce_checkout_order_review'); ?>
    </div>
    <div class="clear"></div>
</form>