pdf and barre code extension in hikashop

-- Joomla version -- : 2.5.28
-- PHP version -- : 5.5.8
-- Browser(s) name and version -- : many

Hi
I study pdf pdf/a file format and how server manage the pdf "meta content/layout" to show content data ( text image link ...) .
I find in hikashop a pay plug in for attach pdf invoice in mail .

I have many questions :
1) Is there others pay extension implemented by hikashop that are not show in the item of name "extension" locate in the main hks menu website ?

I was thinking all the extension where bundle with the bussiness version ? the bussiness hikashop version is for me a kind of "all inclusif" with support ! compare to other ecommerce joomla extension . if i study the url hikashop.com/component/hikashop/product/cid-18.html . I see i can change the number 18 by 19 and i have other pay extension , but don't see a "add to cart " button but a "not sold anymore". Is there a way to know all the others pay extension implemented by hikashop instead test all the number manually !!!



2) To not miss information , in wich module and purpose hks let us create custom content that ll be converted to specific file extension ?
now i see only 2 without take in account html use in mail / website layout
-pdf with the pay pdf plug in for invoice attachment
-raster with the hikaserial extension ( e-ticket ) that convert data product item ( text image custom user value ) to ticket with URL converter to QRcode .
-reading last changelog 2.5 there is SVG support what does that mean ? use an engine converter , use static SVG , use dynamic data embedding in php +SVG..... All enable as a toggle/switch for not use raster output ?

3) because of dry concept , wich library/engine ( if one) is use by hikashop and which are the limit requirement to know when use them for convert
-php code to raster
-text url to QRCode
-content to pdf

Joomla RS extension also support those technology
https://www.rsjoomla.com/support/documentation/rseventspro/getting-started/settings.html
Barcode type: just like any ticket, you can also add barcodes to your generated tickets. This option controls the barcode generation type: Code 39, Code 39 extended, Code 93, Code 128 and, starting with rev. 4, QR code.
Barcode prefix Ver. 1.6.0 introduced the possibility to customize the barcode-s prefix (which is defaulted to RST-)

https://www.rsjoomla.com/support/documentation/rseventspro/plugins-and-modules/ticket-pdf-plugin.html use
- dompdf


4) All joomla structure / extension is base on CMPL component module Plugin Language.. layout ? . It is difficult to know how many extensions ( and new files not change file ) is implemented/added in hikashop bussiness ! RS website has a page with a list of all extension . I Think i have miss the hks web page .....
for give a nexample beetween 2.2.1 and 2.2.3 2 new 2 new css file were added : media\css\rtl.css and opload.css and 14 xml file ( from 147 to 167) so 14 new extensions ? the changelog is incremental information not state information .

I really like hks even best is to know the limit of the tool you use and howto remove those limit !!