Hi,
You can find other thread with the exact same question.
And I'll rewrite here the same thing that I wrote in the other threads : that is not possible
Paypal need a crucial information in order to work : the order id.
So, HikaShop have to create that order so Paypal can perform the payment and then confirm the order.
And the paypal plugin is not the single plugin which is working like that.
Now, there is an HikaShop plugin to automatically cancel order after a certain period of time.
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.