Add fees based on product category for ‘Woocommerce Gift Wrapper Plus’

<?php
add_action( 'woocommerce_cart_calculate_fees', 'basedfeesbysitiweb' );
if ( ! function_exists( 'basedfeesbysitiweb' ) ) {

    function basedfeesbysitiweb( $cart ) {
        $fees = array(
            'cadeau-service'    => 1.24,
        );
		$x = 0;
        foreach ( $cart->get_cart() as $cart_item_key => $values ) {
            $product_categories = get_the_terms( $values['product_id'], 'product_cat' );
            if ( $product_categories && ! is_wp_error( $product_categories ) ) {
                $product_categories = wp_list_pluck( $product_categories, 'slug' );
                foreach ( $product_categories as $product_category ) {
                    if ( ! empty( $fees[ $product_category ] ) && !empty($values['wcgwp_line_item_note']) ) {
						$x++;
					}
                }
            }
        }
		if ($x > 0) {
			if($x >= 2){
				$name      = $x . ' kaartjes bij verpakking';
			}else{
				$name      = $x . ' kaartje bij verpakking';	
			}
			$amount    = 1.24;
			$taxable   = true;
			$tax_class = '';
			$cart->add_fee( $name, $amount * $x, $taxable, $tax_class );
		}
    }
}
?>