Use this snippet to display the remaining balance of any applied gift cards in the cart/checkout page.

gc-display-remaining-balance.php

<?php
/**
 * Plugin Name: WooCommerce Gift Cards - Display remaining gift cards balance
 * Plugin URI: https://woocommerce.com/products/gift-cards/
 * Description: Use this snippet to display the remaining balance of any applied gift cards in the cart/checkout page.
 * Version: 1.0
 * Author: WooCommerce
 * Author URI: https://woocommerce.com/
 * Developer: Jason Kytros
 *
 *
 * Copyright: © 2021 Automattic
 * License: GNU General Public License v3.0
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 */

add_filter( 'woocommerce_gc_checkout_show_remaining_balance_per_gift_card', '__return_true' );