We have researched How Customers React with multiple merchants and have found this to be an unwarranted fear. In all cases, the credit card volume has remained consistent or even increased month over month, with reports from merchants that their customers disregard the convenience fee in 99.2% of transactions.
Unlike surcharge programs, cash discount programs are seen in a better light and fare better with end consumers. If necessary, you reserve the right to waive the fees.