[buildawesome]

CC Processors like Visa and Mastercard do refund fees on CC processing, but the interchange or % of return is smaller than the actual gross. You don't necessarily get "all" of your refund, if you're a merchant.

[adrr]

Only processing fees aren’t refunded which is like 25 basis points for a mid size business.

[jashmatthews]

It’s highly country dependent. Card present transactions are still several percent in many countries.