I paid monies into the incorrect bank account, and luckily they refunded the amount back to me, how to record this in quickbooks online

Hello there, YvonneSmit.

I can show you how to record expenses and refund in QuickBooks Online.

You can create an Expense and Deposit on the same account to offset the amount paid and refunded. Here's how: 

1. Click + New and select Expense or Cheque.
2. Enter the expense details. 
3. Select the account and amounts paid.
4. Click Save and close.

To create a deposit for the refund, here's how: 

1. From the + New button, select Bank Deposit. 
2. In the Add funds to this deposit section, select or enter the supplier name, the account used for the expense, and then the amount. 
3. Select Save and close.

If you're referring to a supplier refund, you can use this article about handling supplier credits and refunds in QuickBooks Online: How do I handle supplier credits and refunds?.

Let me know if you have other questions. Take care and have a great day!