PDF Invoice plugin - send invoice right after orde

-- url of the page -- : xx
-- HikaShop version -- : Business: 2.2.0
-- Joomla version -- : 2.5.14
-- PHP version -- : 5.3.27


Hello!

I've bought and successfully installed/configured Hikashop Business, as well as PDF Invoice plugin.

Everything is great, except that I would like that PDF invoices (bills, actually) are sent to clients e-mails automatically - right after they have placed order. How to configure that, which files/templates to modify? I have medium/good level PHP knowledge, so just please point out direction to dig.

Best regards,
looking forward to answer.

UPDATE:

I've found answer in one of previous threads - www.hikashop.com/forum/2-general-talk-ab...-invoices.html#62180

In the file plugins/hikashop/attachinvoice/attachinvoice.php replace the line:

if(empty($data->mail_name) || empty($data->data->order_status) || $data->mail_name != 'order_status_notification' || $data->data->order_status != 'confirmed') return;

by the line:

if(empty($data->mail_name) || empty($data->data->order_status) || !in_array($data->mail_name,array('order_status_notification','order_creation_notification'))) return;

UPDATE 2 :

It seemed almost great after I implemented modification mentioned above, but unfortunately it turns out that there is additional problem - new registred customers now report that upon registration they receive empty Invoice PDF attached to greetings email. What's wrong?

Thank You very much for Your response.
Here you go - file in attachment.

UPDATE: sorry, it seems that it was my mistake - I accidentaly commented one line more than neccessary. I corrected and now going to test again.