Shopify invoice


I need some help for invoicing of Shopify invoice. I have some charges from bank and Shopify as:

bank charges: 2.99% + 1.00AED per transaction of the total
Shopify charges 2% of total

one is how it can be automated as a customer purchased from the website.

Other is as I am doing it manually making sales invoice how could I do it.
As when I am putting charges in taxes field the total amounts gett decreasing and the percentage it charges is on decreasing amount.

Other 2.99 and 2.00% is fine to put a percentage but it does not accept 1.00AED as actual.