php - paypal express checkout set paypal fee additional -

i have integrate paypal express checkout in our website. know , information paypal documentation.

need set amount parameter in request input , paypal deduct fee based on amount, want paypal add fee additional on amount.

example : product amount : $100.00;

paypal deduct fee 2.9% on $100.00 want add aditional 2.9% on main amount, :

amount = 100.00
fee = 2.9%

than total amount = $100.00 + 2.9% = $102.90

means want paypal automatically set fee on checkout page , charge user.

can me.

thanks in advance.

if want add fee on order you'll need prior sending user paypal, or on review page after user returned paypal.

most people add cart "handling fee" or whatever want call it. if want more accurate should use 2.9% + .30 formula.