Hello,
You will find the dettails regarding the creation of plugins for HikaShop in that page :
www.hikashop.com/support/documentation/6...mentation.html#intro
If you do want to use the core to perform saving action ; you need to load the HikaShop helper and then get the corresponding class
if(!@include_once(rtrim(JPATH_ADMINISTRATOR,DIRECTORY_SEPARATOR).'/components/com_hikashop/helpers/helper.php'))
return false;
$productClass = hikashop_get('class.product');
$product = $productClass->get(1);
$product->product_name = 'New name';
$productClass->save( $product );
You will find all classes in the HikaShop backend folder.
Regards,