Total Price In Email

hi,
i got some questions and need some codes and help in customizing my email tempales.

1.
i'd like to add a custom variable to show total price inside couple of hikashop email templates.
i think i have to define that in preload file and then add the echo code in html
how can i do that ?
by total price i mean the price that user has paid
total price - coupoun discount - point discount + shipping costs
and any other changes !

Thanks

2.

this code :
<?php echo hikashop_getDate($data->cart->order_created); ?>
is returning Shamsi/Persian Date in Admin notification email
but in Status notification email this code is returning English Date Format.
i want a code to return the order creation date in Shamsi/Persian Format in StatusNotification Email !


P.S: My Joomla Admin is in English and my Joomla Front End is in Persian RTL format!

3.
i'd like to show the name of order statuses instead of namekey.
cause it looks like i cannot change the name key but i have changed the name of my statuses and i want to use my status names instead of name keys inside my email templates.

is it possible ?

Hi Nicolas,
Thanks for your answer.
1.
i'm using the code u mentioned and it's working,
any way it's returning number like this: 5102000.00000
can i remove the additional zeros and add thousand separator like this: 5,102,000

2.
Thanks to the article you introduced it's done.

3.
can you tell me the code that echoes the Name of Order Statuses instead of name keys ?
i'm currently using this code and this is returning the namekey.

{VAR:order.order_status}

Thanks Man