Print specific values stored in a post meta array

function get_value( $order, $parameters ) {
    $order_id = Compat\Order::get_id( $order );
    global $wpdb;

    $ref_multibanco = get_post_meta($order_id,'_stripe_multibanco', true); // select array

    $text_print="Ent: ".$ref_multibanco["entity"].'<br>Ref: '.$ref_multibanco["reference"].'<br>Value: '.$ref_multibanco["amount"];

    return $text_print;
}