Hi,
There is not such feature and I am not sure that the feature will be required.
In the current version of HikaMarket you can put products of several vendors in your cart, there is not specific limitation. This feature will be introduce in the next release (currently in test/validation).
Thanks to this option you will be able to know that only products from one single vendors are in the cart.
At this moment you will be able, thanks to a HikaShop view override, to get the vendor of the current cart and display some specific information depending the value.
I will add in the new version a function in the HikaMarket helper which will help you to get this information (something like : hikamarket::getVendorCart() ). Function which will return the vendor_id or an array of the vendor_id if there are several vendors.
Hope it answers to your question.
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.