Emergency ask: can hikashop create same as this page?

hi.
i need simple system for buy serial of license of software.
my customer ask me to create exactly same as this page: www.giftcard.ir (sorry for non-english language of that site but it is clear to understand what does it do)
look at the recorded ScreenCast video for what does it do.( www.screencast.com/t/d493y0g8 )
please say me these questions:
1-if it can create with hikaserial?(if can not, say me what thing can not do by hikaserial?) Answered
2-is it possible put checkout section for buy in one page (at the home page and don't need to redirect to other page for checkout workflow. )
3-is it possible have category Div as a filter(categoryname+category image) and when click on that, show the products in that category without refresh of page?(in my case product is serial) i test filter in hikashop but it seems can not show image of category(only show category name)
i find back/classes/filter.php line 1783 and get this picture after dump $html:

but i can't see image in the cat object.what is php function to get image of category? also i hack the core. can you give me simple example to how use onFilterDisplay to change any thing in filter category name.
also i check this demo page:https://demo.hikashop.com/index.php/en/other-features/products-with-serial-number
but my questions is still without response.(if it need to modify View please say what of that?)

nicolas wrote: Hi,

2. No, you can't do that. HikaShop is a shopping cart extension. So you need first to add the product to the cart and then you can go to the checkout and click on the finish button.
There is no mechanism to have a one page where you can have everything from the categories listing, the products listing the product information and the checkout.

OK i agree that. i set a cart module on product menu item and enable payment.
2-1)what is payment option in cart module? if i enable that it show to me Payment Methods option to select that? if no, is there possible to implement selectable payment plugin for select what gateway for pay in the cart module?
2-2)for fastest checkout workflow something such as www.giftcard.ir , i want do this: use hikashop cart module under the product and when click "Proceed to Checkout" button,then go to checkout workflow page with one step without any registration form and i put some custom JS in my joomla template to auto click on Finish button to go to pay gateway. is it possible and maybe have any problem?

nicolas wrote: 3. To have the products listing refresh below a category listing without changing the page, I also think that the solution is to use a category filter.
And indeed, there is no option to display the image of the category in the filter.
Modifying classes/filter.php will be the easiest.
To get the image of the category, you'll have to use such code:

$db = JFactory::getDBO();
$db->setQuery('SELECT * FROM #__hikashop_file WHERE file_ref_id = '.(int) $category_id .' AND file_type=\'category\'');
$image = $db->loadObject();
$config = hikashop_config();
$image_options = array('default' => true,'forcesize'=>$config->get('image_force_size',true),'scale'=>$config->get('image_scale_mode','inside'));
$imageHelper = hikashop_get('helper.image');
$img = $imageHelper->getThumbnail(@$image->file_path, array('width' => 100, 'height' => 100), $image_options);
echo '<img src="'.$img->url.'"/>';

nicolas wrote: It's going to be difficult to do that elsewhere than directly in classes/filter.php
What you could do is actually override the whole classes/filter.php with a system plugin:
www.hikashop.com/forum/checkout/878018-c...asses-field-php.html
www.hikashop.com/forum/development/88665...le-in-hikkashop.html

very thank you for your code it is work but i can not use overwrite capability and it is not work correctly for me. i read all given link and it seems i only can first class of filter.php to overwrite. can you say me how to overwrite display() in hikashopRadioClass and function displayInList() and function getCategories() in hikashopFilterTypeClass? is it possible give me simple echo helloworld instead of display() in hikashopRadioClass ?
i read some override that you say in different topics but i need sample code to do simple change. now i hack the core and it work. i attached one filter.php from core. can you change file name and class name to right in attached file to put it in MYTEMPLATE/html/com_hikashop/administrator/classes/ and work.

4-i have an other question. all of i do now, for example override and purchase product and setting in cart module can be replicate with serial in hikaserial? i want only sell serial not product.

i search and try more than 4 hours and it seems only i can use displayFilter in the main class (first php class in filter.override.php). am i right?