Send an email to vendor when an order is created to on hold

Hi, when an order is created to on hold, I would like an email to be sent to both the customer and the vendor. At present, it is only sent to the customer. I imagine something like this :
Does anyone have an idea of how to make this work ?

function send_email_on_hold_status( $order_id, $old_status, $new_status, $order ) {
    if ( 'on-hold' === $new_status ) {
        // Get customer email
        $customer_email = $order->get_billing_email();

        // Get vendor email
        // There should be a way to retrieve the seller's email related to the order
        $vendor_email = get_vendor_email($order_id);

        // Email content
        $subject = "Your order is now on hold";
        $message = "Order #{$order_id} is on hold. Contact the buyer at the {$user_phone} ";

        // Send email to seller
        wp_mail( $seller_email, $subject, $message );


Sorry, there’s no simple code snippet for this, it would require a custom implementation. If customizations beyond the available features are required for your site, please consider hiring someone for custom work