Hi,
Paypal adaptive does not work like that.
It allows to create payment with several receiver. At this moment, each vendor would receive his payment part (depending on fees) directly from the customer.
So, with paypal adaptive, the request payment would be no more required (like the "pay vendor").
But this "request payment" still interesting for users who don't want to use paypal adaptive and user other payment plugins.
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.