With this extension you'll be able to set fee or discount to all payment methods available. You may set a fee in percent to one method and discount in fixed value for another one and they'll be applied accordingly.

✪ FEATURES ✪

▸ Adds fee or discount value for each enabled payment method separately.
▸ Fee or discount can be set depending on subtotal minimum or maximum values.
▸ Displays method's name along with fee or discount in title.
▸ You can hide Payment Fee or Discount total and add its value to another total.
▸ Follows tax class, geo zone, customer groups and . . .