Maybe some places operate that way, but I worked on payment systems for a few years and since then I figure most convenience fees come from credit card processi

Maybe some places operate that way, but I worked on payment systems for a few years and since then I figure most convenience fees come from credit card processing rates being passed on to the customer - at least that's how ours worked. https://www.creditdonkey.com/interchange-rates.html https://www.creditdonkey.com/interchange-rates.html