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add_action( 'woocommerce_cart_calculate_fees', function( $cart ) {
    if ( is_admin() || ! $cart->get_cart_contents_count() ) {
        return;
    }

    // 滿 2,000 元折 100 元
    if ( $cart->get_subtotal() >= 2000 ) {
        $cart->add_fee( __( '滿額折扣', 'theme' ), -100 );
    }

    // 指定分類商品加 5% 折扣
    $discount = 0;

    foreach ( $cart->get_cart() as $item ) {
        if ( has_term( 'vip-products', 'product_cat', $item['product_id'] ) ) {
            $discount += $item['line_total'] * 0.05;
        }
    }

    if ( $discount > 0 ) {
        $cart->add_fee( __( 'VIP discount', 'theme' ), -$discount );
    }
});