QBO charged the customer credit card twice for 1 payment trans. How do I correct this without affecting the correct invoice and the first (correct) payment?

To create an expense transaction:

1. Click the + New button and select Check or Expense.
2. Under the Account column, choose Accounts Receivable.
3. Enter the overpayment amount in the Amount column.
4. Choose the customer's name at the top and all the necessary information.
5. Select Save and close.

To link the Check or Expense to credit or overpayment that you are refunding:

1. Go back to the + New button and select Receive Payment.
2. Fill out all the necessary fields.
3. Choose the Check or Expense that you've created.
4. Select Save and close.

Here's a reference for more information: Refund customers for overpayments.

If you processed this through QuickBooks Payments, you can follow the steps outlined in this article: Void or refund customer payments in QuickBooks Online.

Please reach out to me if there is anything else you need in recording this refund transaction. I'd be happy to help. Stay safe and have a lovely day.

On this same subject because QBO charged my client twice for one payment, my client contacted her bank to dispute the 2nd transaction.  Now on my QBO under "Invoices" It is telling me my client disputed the $1000 and it needs attention. What do I do with this? How can I remove this?

Hello, @seceja. 

Thanks for joining in on this thread. 

The steps that my colleague provided above will be the best way to resolve the message you're receiving on the Invoices page. It's a simple process to create an expense transaction to reduce the bank balance. Afterward, you'll link the expense to the customer's overpayment. 

Before doing these steps, I recommend consulting with your account to make sure this is best for your business. If you don't have an accountant, you can check out this link to find one near you. 

If you run into any trouble along the way, just let me know. I'm only a post away. Bye for now!