Hi,
It is the good forum section.
1/ In HikaMarket, you change a fee each time an item is sold.
The feature to let the vendor paid each time he want to add a product is possible but not fully integrated, so for the moment it will require a custom plugin.
2/ All modes are supported.
The vendor can be paid directly (and pay you back your fees afterwards).
You can be paid directly (and pay back your vendors)
Both can be paid in the same time using plugins like "paypal adaptive".
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.