Black list shipping classes for bring shipping rates

bring-shipping-class-filter.php

<?php
/**
 * Filter the bring shipping rates.
 */
add_filter('bring_shipping_rates', function( $rates ) {
	$shipping_classes = [
		'halvpall',
		'pall',
		'stein',
		'uuni-shipping',
	];
	// Look for items with a shipping class that doesn not allow mail.
	$items = WC()->cart->get_cart();
	foreach ( $items as $item ) {
		$shipping_class = $item['data']->get_shipping_class();
		if ( in_array( $shipping_class, $shipping_classes ) ) {
			return [];
		}
	}
	return $rates;
}, 999 );