Cc fees and any other type of fees, postage, etc are cost of good sold. If you sell a widget or provide a service for $20 and pay a fee whether it be to Amazon, eBay, cc or anyone else for $2.00 then your net sale is $28

if a business margins are not acceptable, then raise your prices.  your prices. Don’t try to underhandedly receive more money by charging bogus fees. Enough said on this subject