Compatibility with "WooCommerce Chained Products" plugin

add_filter('thwepo_product_price', 'thwepo45r_product_price', 3, 99);
function thwepo45r_product_price($price, $product, $is_default){
	$product_id = $product->get_id();
	global $wc_chained_products;

	$prices = array();
	$prices[$product_id] = $product->get_price();

	$chained_items  = $wc_chained_products->get_all_chained_product_details($product_id);

	if ( ! empty( $chained_items ) ) {
		foreach ( $chained_items as $chained_item_id => $chained_item_data ) {
			$chained_product     = wc_get_product( $chained_item_id );
			$priced_individually = ( ! empty( $chained_item_data['priced_individually'] ) ) ? $chained_item_data['priced_individually'] : 'no';

			if ( $chained_product instanceof WC_Product && 'yes' === $priced_individually ) {
				$chained_product_price = $chained_product->get_price();
				if ( ! empty( $chained_product_price ) ) {
					$prices[$chained_item_id] = $chained_product_price  * $chained_item_data['unit'];
				}

				$override_price = true;
			}
		}
	}

	if(!empty($prices)){
		$price = array_sum( $prices );
	}

	return $price;
}

add_filter('thwepo_skip_extra_options_for_cart_item', 'thwepo36t_skip_extra_options', 4, 99);
function thwepo36t_skip_extra_options($skip, $cart_item_data, $product_id, $variation_id){
	$skip = (isset($cart_item_data['chained_item_of'])) ? true : false;
	return $skip;
}