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add_action('b2bking_after_pending_quote_order_sent', function($order){
    $to = 'test@gmail.com';
    $subject = 'New Order Awaiting Shipping Quote';
    $headers = array('Content-Type: text/html; charset=UTF-8');
    
    $message = '<h1>Order Details</h1>';
    $message .= '<p>You have a new order that requires a shipping quote. Below are the order details:</p>';
    $message .= '<ul>';
    foreach ( $order->get_items() as $item_id => $item ) {
        $product = $item->get_product();
        $message .= sprintf('<li>%s x %d - %s</li>', $product->get_name(), $item->get_quantity(), wc_price($item->get_total()));
    }
    $message .= '</ul>';
    $message .= '<p>Please upload the shipping quote to the following link: <a href="site.com/link">site.com/link</a></p>';

    // Send the email
    wp_mail( $to, $subject, $message, $headers );
}, 10, 1);