A charge can now be added to a sale to offset the credit card service charge. The charge may be taxed (optional). This update is for version 14. Send support an email to see if you are eligible. Older versions may require an update and small charge. Here is how to set it up after you get the update:
1 – create a Fee% product. Put the %amount (10) in the Price field. Here are the suggested settings in red:
(see pic1 attached)
2 – change Charge to Service Charge (or something).
(see pic2 attached)
3 - Settings / Payment Methods, select the Service Fee% product.