Hi,
Your issue is not really related to HikaMarket (or HikaShop).
To summarize:
With one cart, you will create one order.
With one order, you have one payment.
One payment means that only one payment plugin will be used, so one single people will receive the money.
So if you have in your cart, products from two vendors ; who should be paid ?
That's why when you can have several vendors in the cart ; we just propose the store payment methods and we do not authorize the payment to the vendor.
Otherwise you can use an "adaptive" payment plugin like "Paypal adaptive" or "MangoPay".
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.