My customer paid the invoice in full however, there was a $15 fee charged by the bank. How do I remove the $15. that remains as an unpaid amount on the invoice?

Hi there, 

Congrats on your first post in the Community. I'll be happy to share more info and help steer you in the right direction so you can continue to focus on the things you love the most. QuickBooks is an easy-to-navigate program that simplifies most of your complex accounting calculations. 

Based on the details you've shared above, I highly recommend checking out the following article as it shows you how to: Void or delete transactions in QuickBooks Online. I encourage you to go through the article and let me know if you have any other questions. I'll be one message away in case you need help. 

Otherwise, I wish you a great rest of the week!