Hi,
When you use a product/updatecart in GET mode ; you have to give a "return_url" parameter if you want to indicate to which page you want to redirect the user.
Otherwise HikaShop will use the checkout page as the final destination.
You can use "return_url" (which is urlencode and then base64encode) or you can use "url" (which is just urlencode).
Otherwise, you can use the parameter "tmpl=component", it will display the HikaShop cart (without the rest of the website ; like if you display the content in a popup).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.