WooCommerce Wallet Limit

add_filter(‘is_valid_payment_through_wallet’, ‘__return_false’);
add_filter(‘woo_wallet_partial_payment_amount’, ‘woo_wallet_partial_payment_amount_callback’, 10, 2);

function woo_wallet_partial_payment_amount_callback($amount, $order) {
if (!is_null($order)) {
$order_total = $order->get_total(‘edit’);
if ($amount > $order_total) {
$amount = ($order_total * 20) / 100;
}
} else if (sizeof(wc()->cart->get_cart()) > 0) {
$cart_total = wc()->cart->get_total(‘edit’);
if ($amount > $cart_total) {
$amount = ($cart_total * 20) / 100;
}
}
return $amount;
}

this code is not working.

Please help me