'net_amount' => ($cart_total * $percentage)/100 + ($shipping_total * $percentage)/100,
?

Where this net_amount on dokan_orders table is calculated?

But next thing… Do you have any tips to next problem. If product costs 10 dollars and shipping 10 dollars, i want take seller percentage from total, not only from product price. With my 10% percentage, i get only 1 dollar, not 2 dollar.

Okey, figured that out… For somebody who are looking same thing…

/dokan-paypal-adaptive-payments/classes/class-dokan-paypal-ap-gateway.php add to line 365 next

$payRequest->feesPayer = "SECONDARYONLY";

You can also use PRIMARYRECEIVER or EACHRECEIVER.