Credit card charged 0.00

At least twice since submitting my tax return, I have received an alert from my credit card company that my account was charged, by Intuit, without a card present.  The odd thing is that the charges are for $0.00.  I paid the fee at time of submission, so I owe Intuit nothing.  Why is Intuit accessing my credit account?  (I have not received my federal refund yet, if that makes any difference.)