BY accident?
Yups.
Call the bank and remind them you're a long time loyal customer and it was a one time thing (never to happen again) etc. etc.
I've heard stories of getting it to not post to your Credit Report.
Its my Citi card which is my first card with them, I did call them to remove the late fee but they didn't want to, I'll try again later,
Regarding my credit report, they only report late payments of you're late 30 days from the due date so that BH not an issue here.