Code-Snippets-Functions/Execute a function on a child site/WooCommerce/unique-flat-fee-based-on-item-count-from-category.txt

add_action( 'woocommerce_cart_calculate_fees', 'add_ticket_concierge_fee' );
function add_ticket_concierge_fee( $cart ) {
    $terms = array( 33 ); // Here, set the targeted category(ies) id(s), slug(s) or name(s)
    $fee_amount = 5; // Here, set the flat fee amount (per item quantity)
    $term_count = 0; // Initializing variable

    // Loop through cart items
    foreach ( $cart->get_cart() as $item ) {
        // Check if the current item belongs to the targeted category(ies)
        if( has_term($terms, 'product_cat', $item['product_id']) ) {
            $term_count++;
        } 
    }

    if($term_count > 0 ) {
        $cart->add_fee( 'Ticket Concierge Charge', $fee_amount * $term_count, true );
    }
}