Acceptance of payments on-line with a commission from the payer. What services do they provide?

Question

Payment systems

Essence of the question: it is necessary to arrange payment on the site so that when paying (most often with a card)
, the payment amount includes a commission for the goods, or so that the aggregator has the function of withdrawing a commission from the client upon such payment.
What services allow you to make such a setting (or banks with an Internet acquiring service)?

Answer 1

Take your prices on the site / store / whatever you have, add the desired / average% of the commission, you're done.
Why should the service understand that this is a commission.