We would like to accept credit cards from our customers through QB, but want them to automatically cover the 3.4% + 25 cent fee. Is there an automated way to do this?
Only if you raise the prices as needed.
First thing is to check your state laws, there are some states where surcharging for using a CC is illegal.
For those states that are ok with it, there is still a problem. You are required to put a notice on the store, the check out pages, and on the receipt it must specify the surcharge item and amount, that you surcharge for using a CC and how much, the law says a % is not legal. In addition to that, you are not allowed to surcharge when a debit or prepaid card is used at all. So if you are taking payments on line I don't see how you can know whether or not a card is a prepaid or debit card in advance.