Here is a business apology letter sample that you can use as an outline for writing your own apology letter. You can find more apology letter samples below.
Business apology letter sample
City, State, Pin code
March 4, 2020
Dear (Recipient Name):
Due to an oversight on our part we failed to make the payment of $120 on invoice number 101865 on time. We sincerely apologize for this mistake. Please note that we mailed the payment today and it should reach your office in a day or two. We assure you that we will not commit this mistake again. Please feel free to call us if you have any further questions at (phone number).